Famous concert violinist who turns evil after a train accident crushes his hands and he receives a cursed hand transplant from gypsy death-row convict Joe Romany.
From the "The Fiddler of Death" story in Quality comic book Uncle Sam Quarterly #2 (Winter 1941). Freaked out by his hideously powerful and oversized new hands, he kills a nurse, runs off to the jungles of South America and discovers he can play a local violin-like instrument in a way that makes the local apes do his bidding. Superhero and embodiment of America, Uncle Sam, takes him down.
Malvolo's first name is never given.