Russ Hamilton, Jamie Gold, Ray Bitar, Howard Lederer, Sheldon Adelson.
These five are very infamous in the poker community. Russ was the big part of the Ultimate Bet Superuser scandal, Jamie Gold was a cruddy excuse for a poker player, Ray and Howard were big parts of the Full Tilt scandal, and Sheldon Adelson has spent a lot of money trying to shut down online gambling with "RAWA".