The conversation is in the book "Wiretap" by James Goode. Scopo says Roy was with the Gallo's, and later went with the Gambino's because he thought he would get killed by the Columbo's. Scopo says it was worked out for Roy to stay w/the Columbo's, but Roy was scared and changed to the Gambino's.
exactly 100% where i got it from and it makes sense what scopo is saying because Roy was born and lived next door to the Profacis
Ill post the wiretap verbatim when I get home later
ps that Gallo Crew was heavy..The gallos,Mike Rizzi, Bobby Borello and Roy Demeo, dangerous bunch of dudes...