A. Bryan Singer - fagbag cleared of possible involvement in sex ring (dude dropped the charges-->though Singer settles with a youth for Apt Pupil); this POS will always have The Usual Suspects and for starting the X-Men Marvel franchise (after Blade showed them it was a reality)
B. Victor Salva - One of his greatest movies is also his biggest indictment. Clownhouse, a horror gem, involves murderers that escape from the psyche ward, kill clowns that are in town for the circus/state festival-fair and terrorize young boys. In real life he fukked the star of the movie and recorded it.
This POS also made also made the Jeepers Creepers movies, which are very good. It's about a monster that terrorizes, wait for it, ... young men ...
C. Woody Allen - left his wife to marry his adopted daughter. No, not some woman he adopted, the 8-year old (or so) little girl he raised. This POS has made/still makes great dramedies, including his latest flick from Manhattan, Match Point and Cafe Society.
Feel free to add on. Other than Chinatown, Roman Polanski's movies never appealed to me so I omitted him