Joe McKnight's shooter, Ronald Gasser, released from custody

[Mc Mike]

32. ...

" ...
He formed his own crew of young Irish-American gangsters, called The Celtic Club. His main enforcers were Keith Ritson, Kevin McTaggart, Brian O'Donnell, Danny Greene, Jr. and Billy McDuffy, who set up gambling dens across the city. He also allied with John Nardi, a "Cleveland family" labor racketeer who wanted to overthrow the leadership. Underworld crime figures note that James "Icepick" Sterling, a gun and explosives expert, is believed to have almost 60 contract killings under his belt but was never arrested or questioned in any of the Cleveland bombings. “Retired” after Greene's 1977 death, Sterling moved to Troy, Michigan. The relationship between Greene and Birns began to sour. Greene had asked Birns for a loan of $75,000 to set up a "cheat spot", a speakeasy and gambling house. Birns arranged for it through the Gambino crime family. The money was lost in the hands of Birn's courier Billy Cox, who purchased Cocaine. The police raided his house, arrested him, seized the narcotics and what was left of the $75,000. The Gambino family wanted their money. Shondor pressed Greene who flatly refused to return it, reminding him that he couldn't return something he never received and that Birn's Courier had lost it.[9]

To settle the dispute, Birns directed an associate to hire a hitman for Greene and gave him $25,000 for the job, especially in the event of any harm befalling him. Several minor underworld characters, burglars by trade, took the contract, but made numerous failed assassination attempts on Greene. Not long after, Greene found an unexploded bomb in his car when he pulled into a Collinwood service station for gas. The explosive was wired improperly and failed to detonate. Greene disassembled the bomb himself, removed the dynamite, and brought the rest of the package to a policeman, Edward Kovacic. Kovacic offered him police protection, but he refused. He refused to hand over the bomb, telling him, "I'm going to send this back to the old bastard that sent it to me".[citation needed] Suspecting that Birns was behind it, Greene decided to retaliate. On March 29, 1975, Holy Saturday, the eve of Easter, Birns was blown up by a bomb containing C-4, a potent military explosive, in the lot behind Christy's Lounge, the former Jack & Jill West Lounge, a go-go spot at 2516 Detroit Ave. near St. Malachi's Church.[10]

...

UNIDENTIFIED: "How can a marked man put a big flag in front of his house? He had a big Irish flag out by the side; anybody could see it. He put it there on purpose. He'd be sitting out there under the sun."
CALANDRA: "He has some pretty good connections, though."
LICAVOLI: "He had some connections all right. The fucking FBI. He used to tell them about every goddamned thing everyone did."
CALANDRA: "You know that with Greene? He was the FBI's boy?"
LICAVOLI: "Oh, fuck yes. But he didn't work with the FBI, he told them what to do! He told them what to do. He said FBI your ass. He thought he got so fuckin' big. Well, he wanted it all; that's all. Him and Nardi. That fucker. He used to give them the money, and he used to give them all the information. "

https://en.wikipedia.org/wiki/Danny_Greene