New Orleans dock workers and unionization

Dockworkers in New Orleans at the turn of the 20th century often coordinated their unionization efforts across racial lines. The nature of that coordination has led some scholars to conclude that the seeming interracial union activity was in fact biracial: a well-organized plan of parallel concerted activity with coordination and support between the groups, but with a clear divide along racial lines.

Source: Wikipedia — New Orleans dock workers and unionization (CC BY-SA 4.0)