I heard (or read) somewhere that Richard Castellano was actually the hightes paid actor appearing in 'The Godfather'. This makes sense since Pacino/Caan/Duvall were not yet the established stars that GF would play a part in making them...and as we all know Brando took a pretty low salary as his career wasn't in the best shape by this time. And let's face it, pre-production GF was not envisioned to be the enormous, legendary success that it was.

By the time GFII was ready to be made, Castellano's status and clout were a thing of the past...which was apparent to just about everybody but him.

Apple

A wise and frugal government, which shall leave men free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned - this is the sum of good government.

- THOMAS JEFFERSON