According to Wikipedia,
Daniel John Patrick Greene was an Irish-American organized crime figure based in Cleveland, Ohio. Greene gained power first in the local chapter of the International Longshoremen's Association, where he was elected president during the early 1960s. He later became a full time crime boss and began competing with Jewish-American organized crime figure Shondor Birns and the Italian-American Cleveland crime family for control of the city's criminal underworld. Greene set up his own crew called the Celtic Club, complete with enforcers and a close alliance with outlaw biker gangs.