In the annals of New York City crime, few undertakings were more ill-advised, foolhardy and just plain dangerous than the one that prosecutors say was chosen by Thomas and Rose Marie Uva, a young married couple from Queens.

The Uvas set out more than a dozen years ago to solve their financial difficulties in a most unusual fashion: walking into mob social clubs with an Uzi submachine gun and separating the Mafiosi within from their ill-gotten gains.

The crime spree was predictably short-lived. They were killed in 1992 in one of the more public executions in the recent history of organized crime in New York. On Christmas Eve, in broad daylight on a busy Queens thoroughfare, they were each shot several times in the head as they sat in a car at a traffic light. Ms. Uva, the authorities said, had more than $1,000 in her wallet; investigators said they believed the couple might have been out for some last-minute Christmas shopping.

No one had been charged in the case until yesterday, when F.B.I. agents and police detectives arrested a man, whom they accused of being a captain in the Gambino crime family, on charges that he was part of the hit team that killed the couple.