I believe that Jewish interests lobbied to keep the Wolz scene out of the film and home video releases. I applaud the groups if they got that done.
...and if they did, Italian groups (like the Italian-American Civil Rights League, headed by Joe Columbo) lobbied to remove references to "Mafia" and "Cosa Nostra." Didn't matter in either case: We knew Woltz was a pederast without the deleted scene (he told Tom that the starlet Johnny stole from him was "...young, beautiful, innocent, the greatest piece of ass I ever had..."). And we knew the Corleones were an Italian organized crime family without the use of "Mafia" and "Cosa Nostra."