sentences:  Another of his early acts as Police Commissioner was the appointment of three "Strong Arm" anti-vice squads and their commanders—one of whom, Charles Becker, was later executed for complicity in the July 1912 murder of the bookmaker Herman Rosenthal (shortly after Rosenthal had told the press of extortion by Becker and other police).Acting Mayor Ardolph Kline's elected successor, John Purroy Mitchel, indicated before taking office at noon on January 1, 1914, that he would not keep Commissioner Waldo in office.Waldo tendered his resignation effective at midnight December 31, 1913, after transferring or accepting resignations from most of the department's senior officers and specialists.