If Fred Koch hadn't modernized the Soviet oil industry for Stalin, maybe we'd all be speaking German by now? Of course Texaco, Prescott Bush, Henry Ford were tight with the other guy.
Story goes that he was deeply troubled that many of his key Soviet personnel were committed Bolsheviks but were nevertheless purged. So he came home and helped start the John Burch Society.
Orwell came to a similar conclusion regarding Stalin but didn't change his leftist orientation.