Infuriating law-enforcement organizations and his colleagues, a City Council member, Charles Barron, introduced a resolution yesterday urging clemency for a convicted and escaped cop-killer, Assata Shakur, formerly known as Joanne Chesimard. On May 2, 1973, Chesimard was involved in a roadside shoot-out with New Jersey State Police after the vehicle in which she and two companions were traveling was pulled over because of a malfunctioning taillight. During an exchange of gunfire, a New Jersey state trooper, Werner Foerster, was wounded. Chesimard, then a member of the Black Liberation Army and the Black Panther Party, was convicted of first-degree murder in...