Governor Tobin remained active in Democratic politics, however, and campaigned vigorously for
President Truman in 1948. Tobin repeatedly denounced the
Taft-Hartley Act of 1947, making 150 speeches against it in the 1948 election campaign. He argued that it was bad for workers. Upon Truman's reelection, Tobin was appointed as U.S. Secretary of Labor, a position he held until the close of the Truman Administration in January 1953. Tobin discovered that the Department of Labor had minimal influence; it did not control the National Labor Relations Board, or the Mediation Service, which were more influential. In 1949 he had president Truman transfer the United States Employment Service and the Unemployment Insurance Service to his department. He also managed to move several smaller bureaus, and he created a Federal Safety Council. Although the Democrats regained control of Congress in 1948 election, the Conservatives were still dominant and Tobin and Truman were unable to repeal Taft-Hartley. Tobin's most notable action as Labor Secretary came in the Fair Labor Standards Amendments of 1949, which increased the minimum wage to 75 cents an hour, and strengthened the prohibitions on child labor. Tobin played a role during the Korean War in coordinating defense manpower needs. However, in the steel strike of 1952, Tobin came out on the side of the unions, saying that "the time for impartiality" had passed, and that the unions were justified in their wartime strike. In 1951, Tobin attacked Senator
Joseph McCarthy, a fellow Irish Catholic, calling on fellow Catholics to repudiate McCarthy's "campaign of terror against free thought in the United States." ==Later months and death==