One holder of this office replaced a police commissioner with a state banking commissioner to ensure that Prohibition would not be enforced. Samuel Seabury led the Hofstadter Committee to investigate the corruption of one holder of this office, who called bribes “beneficence.” In an anti-crime campaign, another holder of this position claimed that he would “drive the bums out of town” before being photographed using a sledgehammer to destroy a slot machine. That holder of this position ordered the arrests of Frank Costello and Lucky (10[1])Luciano after winning an election on a Fusion ticket endorsed by Franklin D. Roosevelt. Jimmy Walker’s resignation weakened Tammany Hall’s control of this position. For 10 points, Fiorello LaGuardia held what position that governs the United States’ most populous city? ■END■