Fiorello La Guardia was an influential American politician, known for his energetic and charismatic personality, he made significant reforms during the Great Depression and World War II, including unifying the transit system, expanding public housing, and fighting the influence of the Tammany Hall political machine. A Republican with socialist ideals, La Guardia was a national political figure who supported President Roosevelt's New Deal, which helped secure federal funding for New York City during tough times.