The Green Light letter from President Franklin Roosevelt to Major League Baseball Commissioner Kenesaw Mountain Landis gave MLB permission to continue throughout World War II. The team owners felt relief that MLB is the only professional sport to survive during the years of World War II (1941-1945). MLB became a primary contributor toward the war effort. While war-supporting efforts were conducted, team owners positioned themselves to benefit from the bond between baseball and the American people. MLB portrayed itself through the commissioner’s office policy as a patriotic partner by providing entertainment for American factory workers and contributing equipment to servicemen overseas. MLB also remained a monopoly without Congressional inquiries or public challenge. Since MLB was exempt from anti-trust laws, team owners operated within MLB’s anti-trust exemption and strengthened position for the post war period.