The federal government went too far in shielding an FBI informant from the 1970s through the 1990s, not only tipping him off about state and local police investigations, but even covering up his involvement in several murders. Last week a three-judge panel of the First Circuit Appeals Court in Boston ruled that the family of one of those murder victims, Louis Litif, who was murdered by Boston organized crime boss James “Whitey” Bulger in 1980, was entitled to government compensation of $1.15 million. Litif, a bookmaker facing murder charges, offered to help the Boston police with a drug conspiracy case against Bulger, who was already secretly informing on the rival Patriarca crime family to the FBI. About three weeks after his offer, Litif was found dead in the trunk of his car. The First Circuit concluded that “there was a pattern of FBI leaks of informants to Bulger,” mainly by Bulger’s FBI handler, John Connolly, who “was present when...