It's possible. Calabro was killed in NJ. Kuklinski was from NJ. People say the accusations against Gravano were baseless embellishment on Kuklinski's part, but the Kuklinski first brought up the topic on HBO (?) not to any prosecutor looking to cut a deal with him, so that doesn't add up.

Calabro is mentioned in Murder Machine as one of the dirty cops working for Roy Demeo. So that is another connection to Demeo that Kuklinski seems to have.

Why is it inconceivable to some that the mafia might use hitmen for hire? Just because they are supposed to be a group of killers themselves means they always have a made man do "the work?? I don't think so. If you go back to the Murder Inc days, you have the "Brownsville boys" being paid retainer, and then per "job"...by the mafia, to do hits.

The mafia is into every illicit trade, even drugs, but not murder for hire? I don't buy that.