A new report by the House Committee on Government Reform has determined that more than 20 people have been killed by FBI informants in the Boston area since 1965 often with the assistance of FBI agents. And the FBI has allowed innocent men to be sentenced to death in order to protect informants. No FBI agent has ever been disciplined. The report concluded that the FBI’s use of killers as informants “must be considered one of the greatest failures in the history of federal law enforcement.”