The Subversive Activities Prevention Law (SAPL) was the last major controversial law to be drafted at the end of the Allied Occupation of Japan (1945-1952) which was managed and controlled by General Headquarters (GHQ) under U.S. General MacArthur and was enacted into law after Japan had regained its formal independence in 1952. It turned out to be an extremely controversial law that was vociferously opposed by the political opposition in and out of the Diet in light of the prewar history, surrounding how such internal security laws were implemented by the state security apparatus. The demonstrations in 1951-52 against the proposed law, organized by the labor unions, were the largest, loudest and most determined since the end of the war.