Boris Karloff brought a touch of class to the Monogram release schedule with his "Mr. Wong" mysteries. This prompted producer Sam Katzman to engage Bela Lugosi for a follow-up series of Monogram thrillers. Katzman hit the bull's-eye with his street-gang series The East Side Kids, which ran from 1940 to 1945. East Side star Leo Gorcey then took the reins himself and transformed the series into The Bowery Boys, which became the longest-running feature-film comedy series in movie history (48 titles over 12 years). During this run, Gorcey became the highest-paid actor in Hollywood on an annual basis.