The Asaros had a long running grudge with Bonanno and they sided with DiGregorio.
Evola, Zicarelli, Marangello and Sabella I believe were all initially loyal with Bonanno but tried to remain on sidelines and neutral (I'm not sure if any switched sides). Actually most crews tried not to get involved in the conflict, no matter which side they were on. Zicarelli also wanted to switch to DeCavalcantes in the chaos that ensued.