Didio was at onetime the bodyguard of Salvatore Gingello and later became a capo. When family boss Samuel Russotti and others were convicted of murder in 1977, Didio was appointed as Acting boss of the family. Didio was allegedly the man who had tipped off Russotti, Rene Piccarreto and Gingello of Frank Valenti's skimming of the family profits which led to the ascension of Russotti as boss and the exile of Valenti.