Assaults on law enforcement officers : hearings before the Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws of the Committee on the Judiciary United States Senate, Ninety-first Congress, second session on S. 4325, a bill to prohibit flight in interstate or foreign commerce to avoid prosecution for the killing of a policeman or fireman; S. 4348, a bill to prohibit assaults on state law enforcement officers, firemen, and judicial officers; S. 4359, a bill to amend chapter 84 of title 18 of the United States code, relating to the injuring or killing of police officers because of their official character, and for other purposes and S. 4403, a bill to provide criminal penalties for acts committed in furtherance of urban terrorism, to provide licensing provisions and criminal penalties designed to control the unlawful use of explosive, and for other purposes