Originally they did. But after the Mineo murder, some Mineo members joined the Maranzano group. (Mangano, Gambino, Scalise.) Others remained loyal to Masseria. Off the top of my head the Masseria loyalists were Anastasia, Joe Biondo, Joe Traina...
Fair enough i'm quite sure i read somewhere after the Masseria murder Scalise got demoted as boss because he was a close ally to Masseria.
