Offenses and, in appropriate instances, specific defenses, are defined in simple, concise terms, and those existing provisions found to be obsolete or unusable have been eliminated -- for example, operating a pirate ship on behalf of a "foreign prince," or detaining a United States carrier pigeon. Loopholes in existing law have been closed -- for example, statutes concerning the theft of union funds, and new offenses have been created where necessary, as in the case of leaders of organized crime.