Seems like there's two theories behind Biello's murder, one saying that Joe Bonanno ordered it and another one saying that Fat Tony Salerno ordered it.
Johnny Biello was a former Luciano/Genovese capo. Joe Bonanno has no right to clip him. He's not that stupid to try. That had to come (100%) from his own crew. It always does.
That is a stedfast rule, and nobody is gonna leave themselves open to a war with another crew for that.
The fact is that Biello was killed and Joe Colombo was made boss of the family. Why the Commission members didn't help him?