The Amalgamated Transit Union (ATU) is the largest labor organization representing transit workers in the United States and Canada, founded in 1892. It comprises over 200,000 members across more than 270 local unions in 46 states and 9 provinces. The ATU fights for the interests of its members, advocating for better pay, working conditions, and public transit services. It also engages in collective bargaining, organizing local unions, and addressing issues related to transit workers' rights and safety.