In 2004, Carmine Caridi was banned by the Oscars, raising an understandable question around why he wasn’t welcome. Best known for his role as Carmine Rosato in The Godfather Part II and The Godfather Part III, Caridi also played minor roles in films like 1978s Kiss Meets the Phantom of the Park and 1992s Ruby. Additionally, he portrayed Dan Valenti in the TV show Phyllis from 1976 to 1977. Although Caridi never received an Academy Award nomination, he was an active Oscar voter for a brief period until the Academy banned him from the Oscars.
https://screenrant.com/why-carmine-caridi-oscars-academy-banned/