U.S. Supreme Court rules in Anderson v. Mt. Clemens Pottery Co. that preliminary work activities, where controlled by the employer and performed entirely for the employer's benefit, are properly included as working time. The decision is known as the "portal to portal case" - 1946

A contract between the United Mine Workers and the U.S. government establishes one of the nation's first union medical and pension plans, the multi-employer UMWA Welfare and Retirement Fund - 1946

At least 30,000 workers in Rochester, N.Y. participate in a general strike in support of municipal workers who had been fired for forming a union - 1946