Taft–Hartley Act
The act, still active, was sponsored by Senator Robert A. Taft and Representative Fred A. Hartley, Jr., and became law despite U.S. President Harry S. Truman's veto on June 23, 1947. Labor leaders called it the "slave-labor bill" while President Truman argued that it was a "dangerous intrusion on free speech", arguing that it would "conflict with important principles of our democratic society".