Company lists · Data refreshed September 2026
Top 25 Worker advocacy groups based in the United States
RevenueBase identified 294 worker advocacy groups headquartered in the United States as of September 2026 and tracks 6,048 professional contacts across them, including 1,920 with verified work emails. New York is the largest hub.
This list covers worker advocacy groups headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest worker advocacy groups based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,406 contacts → | ||||
Partial evidence “We are the Service Employees International Union, an organization of 2-million members united by the belief in the dignity and worth of workers and the services they provide and…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 2 | 420 contacts → | ||||
Partial evidence “The AFL-CIO represents people who work.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 3 | 334 contacts → | ||||
Partial evidence “Working America unites working people who don’t have a union on the job.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 4 | 198 contacts → | ||||
Strong evidence “The Solidarity Center stands with workers everywhere fighting for fair wages, safe workplaces and fundamental freedoms – when workers have the knowledge and support to advocate…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 5 | 195 contacts → | ||||
Partial evidence “The National Domestic Workers Alliance NDWA) organizes domestic workers in the United States for respect, recognition and labor standards.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 6 | 150 contacts → | ||||
Indirect evidence “Outten & Golden is a nationally recognized law firm for employees.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 7 | 110 contacts → | ||||
Partial evidence “Verité is a global, nonprofit organization with a mission to ensure that people worldwide work under safe, fair, and legal conditions.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 8 | 100 contacts → | ||||
Partial evidence “HKM is a national employment law firm that represents individuals and workers in all aspects of employment law.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 9 | 80 contacts → | ||||
Indirect evidence “Willig, Williams & Davidson is one of the largest and most respected union-side labor law firms in the United States.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 10 | 77 contacts → | ||||
Partial evidence “Members of UNITE HERE Local 11 join together to fight for improved living standards and working conditions.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 11 | 71 contacts → | ||||
Strong evidence “Legal Aid at Work promotes the rights and economic self-sufficiency of low-wage workers and marginalized communities through free legal services, education, and advocacy at the…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 12 | 70 contacts → | ||||
Partial evidence “At Jobs With Justice, we are leading the fight for workers’ rights and an economy that benefits everyone.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 13 | 67 contacts → | ||||
Partial evidence “Since our founding in 1969, the National Employment Law Project has fought to secure the rights of workers and unemployed people across the country.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 14 | 51 contacts → | ||||
Indirect evidence “Employee Justice Legal Group, PC is a California based law firm, with headquarters in Los Angeles, CA and offices in Orange County and San Diego as well.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 15 | 51 contacts → | ||||
Indirect evidence “Since our founding in 1995, we’ve been pioneering policy campaigns that are then adopted across the nation, from the groundbreaking Children’s Health Initiative, to raising the…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 16 | 49 contacts → | ||||
Indirect evidence “The American legal system is in a constant state of change.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 17 | 42 contacts → | ||||
Indirect evidence “For confidence and safety in the marketplace.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 18 | 41 contacts → | ||||
Indirect evidence “Altshuler Berzon LLP is a San Francisco law firm dedicated to providing the highest quality representation in the service of economic justice and the public interest.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 19 | 41 contacts → | ||||
Partial evidence “The Official Web Page of the United Farm Workers of America” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 20 | 39 contacts → | ||||
Partial evidence “At Cohen, Weiss and Simon LLP, we are proud of our reputation as one of the nation's leading firms devoted exclusively to the interests of labor and working people.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 21 | 39 contacts → | ||||
Partial evidence “At Barrett & Farahany, we advocate on behalf of wronged employees in all matters of employment law.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 22 | 38 contacts → | ||||
Partial evidence “Workers Defense Project (WDP) is a membership-based organization that works to empower low-wage workers to achieve fair employment through education, direct services, organizing…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 23 | 37 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 24 | 35 contacts → | ||||
Indirect evidence “O'Donoghue & O'Donoghue LLP is one of the largest and oldest union-side law firms in the United States, with offices in Washington, D.C, Philadelphia, Pennsylvania, and Annapolis…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 25 | 29 contacts → | ||||
Partial evidence “A Law Firm For The People Who Keep America Working Weinberg, Roger & Rosenfeld is one of the nation’s leading firms representing unions and working people in all aspects of labor…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: worker advocacy groups. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names worker advocacy groups.
- Partial evidence
- Its own public description names part of worker advocacy groups, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name worker advocacy groups. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 294 worker advocacy groups based in the United States
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Worker advocacy groups based in the United States at a glance
As of Sep 22, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 294 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among worker advocacy groups, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “worker advocacy groups”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names worker advocacy groups), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among worker advocacy groups, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 1,920 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 22, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names worker advocacy groups, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many worker advocacy groups are there based in the United States?
RevenueBase identified 294 worker advocacy groups headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
SEIU, headquartered in Washington, tops this list with the largest team on record.
Which city has the most worker advocacy groups?
New York leads with 24 headquartered companies, followed by Washington (23) and Los Angeles (21).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,920 verified decision-maker contacts tracked across these 294 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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