William O'Dwyer was the 100th Mayor of New York City, holding that office from 1946 to 1950. O'Dwyer was born in County Mayo, Ireland and studied in St. Nathys College, Ballaghaderren. He migrated to the United States in 1910, after abandoning studies for the priesthood. He worked as a laborer, then as a New York City police officer, while studying law at night at Fordham University Law School. He received his degree in 1923 and then built up a successful law practice before serving as a Kings County Court judge. He won election as the Kings County District Attorney in 1939 and his... prosecution of the organized crime syndicate known as Murder, Inc. made him a national celebrity. After losing the mayoral election to Fiorello La Guardia in 1941, O'Dwyer enlisted in the US Army, achieving the rank of brigadier general. In 1945, O'Dwyer received the nomination of the Tammany Hall Democrats and easily won the mayoral election.
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| Birthdate: | July 11, 1890 |
| Birthplace: | County Mayo |
| Date of death: | November 24, 1964 |
| Religion: | Roman Catholicism |