C-6 was Alfred “Sharkey” Cupola (Genovese)
"Sharkey" Cupola was an old-time East Harlem based soldier who served under capo Anthony "Fat Tony" Salerno. He lived in Jamaica, Queens but was a daily fixture up in Harlem since at least the 1930s. He is probably best known for having assisted Salerno and their borgata by helping control the Genovese crew's vast policy-numbers network.
.....and then there were 3.