This is from an old Cleveland Newspaper article about Greene from October 1982.

Danny Greene encouraged his crime partners Kevin McTaggart, Keith Ritson, Brian O'Donnell and his son Danny Jr. to get involved in Irish history. Greene, who considered the Irish a superior race, was so well read in Celtic history that he probably could have taught the subjects on a post-graduate level. He was so imbued with a sense of his ancestry that he wore green clothes, drove a green car, handed out green pens and had his apartment decorated in green. Even in his final hectic days, he asked an aunt to prepare him a family tree. Greene's son Danny was a tough kid and was his only son that was involved in a life of crime.

Greene may have been a killer, but he had another side. Imagining himself as a feudal baron, he supported a number of destitute Collinwood families, paid tuition to Catholic schools for various children and, like the gangsters of the Twenties, actually had turkeys delivered to needy households on holidays.