During World War II, Tobin strongly supported the labor movement's no-strike pledge. In early 1942, President Roosevelt asked the AFL and CIO to appoint members to a "Labor War Board" (also known as the "Labor Victory Board") to advise him on how labor could contribute to the war effort. Tobin and the other labor leaders agreed to cease raiding one another and to not strike for the duration of the national emergency. Nevertheless, Tobin sanctioned strikes involving Midwestern truckers in August 1942, Southern truckers in October 1943, and brewery workers and milk delivery drivers in January 1945. But he also demanded that other unions punish wildcat strikers, asked the public to punish those unions which went on strike, and ordered his own members to cross picket lines unless specifically told not to by the international union.