The American Student Union (ASU) was a national left-wing organization of college students of the 1930s, best remembered for its protest activities against militarism. Founded by a 1935 merger of Communist and Socialist student organizations, the ASU was affiliated with the American Youth Congress. The group was investigated by the Dies Committee of the United States House of Representatives in 1939 over its connections to the Communist Party USA. With the group's Communist-dominated leadership consistently supportive of the twists and turns of Soviet foreign policy, the Socialist minority split from the group in 1939. The organization was terminated in 1941.