That is Gregory Scarpa informant number. Carmine had a lot of information on a lot of top people in the 5 families on his rise to power, which allowed him to take over the Colombo crime family. For the sake of argument I have not seen anything to say Carmine was an informant, even the four top echelon informants who are unknown to me in New York don't have anything that remotely lines up with Persico being an informant. This is from the 1960s to 1980s. For the record Scarpa was not the only Colombo member talking before the 1980s.