The 1920s, 1930s, 1940s were pivotal decades for workers and their unions in the United States.  At the height of the economy of the Roaring Twenties, the possibilities for unions and working-class political activism seemed to be at an all-time low.  However, during the Great Depression of the 1930s, workers began to rebuild the labor movement, and many unions consolidated their gains during World War II in the 1940s.  What were some of the major developments and events that created the possibilities for unions to grow in the 1930s and 1940s?  In what ways was union power still limited?  How did the growth of the labor movement affect workers and their employers?  Were all workers able to share equally in the growth of the labor movement?