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He won the support of unions when he opposed the Taft-Hartley Act by vetoing it.  This would later lead to a three split run in the Democratic Party but Truman prevailed and though his opponent Dewey was initially leading, he won the elections.

Prior to the 1948 presidential campaign, Truman won back the support of labor unions by doing a train tour through the United States' main cities, called Whistle Stop Tour.

As president, Truman faced complicated internal issues. The disorganized postwar conversion of the United States economy was marked by severe shortages, numerous strikes, and the approval of the Labor Management Relations Act against unions by Congress and over the presidential veto. Against all odds he won the 1948 elections, helped by his famous Whistle Stop Tour.