https://en.m.wikipedia.org/wiki/International_Brotherhood_of_Teamsters

The International Brotherhood of Teamsters (IBT) is a labor union in the United States and Canada. Formed in 1903 by the merger of the Team Drivers International Union and the Teamsters National Union,[2] the union now represents a diverse membership of blue- and white-collar workers in both the public and private sectors, totalling about 1.3 million in 2015.[1] The union was formerly called the International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America.

https://en.m.wikipedia.org/wiki/Brotherhood_of_Maintenance_of_Way_Employes

The Brotherhood of Maintenance of Way Employes (BMWE) – later to become the Brotherhood of Maintenance of Way Employes Division of the International Brotherhood of Teamsters (BMWED) – is a national union representing the workers who build and maintain the tracks, bridges, buildings and other structures on the railroads of the United States.

The Communications Workers of America (CWA) is the largest communications and media labor union in the United States, representing about 700,000 members in both the private and public sectors (also in Canada and Puerto Rico).[1][2] The union has 27 locals in Canada via CWA-SCA Canada (French: Syndicat des communications d'Amérique) representing about 8,000 members. CWA has several affiliated subsidiary labor unions bringing total membership to over 700,000. CWA is headquartered in Washington, DC, and affiliated with the AFL–CIO, the Strategic Organizing Center,[3] the Canadian Labour Congress, and UNI Global Union.

https://en.m.wikipedia.org/wiki/Communications_Workers_of_America

UNI Global Union, formerly Union Network International (UNI), is a global union federation for the skills and services sectors, gathering national and regional trade union. It has affiliated unions in 150 countries representing 20 million workers. The head office is in Nyon, Switzerland. UNI Global Union ratified over 50 Global Framework Agreements with multinational corporation as of 2021.[1]

https://en.m.wikipedia.org/wiki/UNI_Global_Union

The Strategic Organizing Center (SOC), formerly known as the Change to Win Federation (CtW), is a coalition of North American labor unions originally formed in 2005 as an alternative to the AFL–CIO. The coalition is associated with strong advocacy of the organizing model. The coalition currently consists of Service Employees International Union (SEIU), the United Farm Workers (UFW), and the Communications Workers of America (CWA), the latter of which is affiliated with both the SOC and the AFL–CIO.

https://en.m.wikipedia.org/wiki/Strategic_Organizing_Center