The Investigation
The suspects were often described as "urban terrorists" in the press and cops everywhere were deeply worried about the role of the Black Liberation Army.The B.L.A. was a notorious and violent group of extremists who planned and carried out unprovoked shootings of uniformed police officers. During the 1970s and early 1980s, there were several of these types of killings of which the B.L.A. were suspect. On May 20, 1971, New York City Police Officers Joseph Piagentini and Waverly Jones were shot and killed in an ambush in Harlem.
The following year, on January 28, 1972, officers Gregory Foster and Rocco Laurie were murdered outside a restaurant in Manhattan. Another such shooting occurred on the night of April 16, 1981 when uniform cops pulled over a suspicious van in the St. Alban's section of Queens.
Without any warning, two men jumped out of the rear of the van with machine guns and opened up on the unsuspecting cops. Both were immediately killed. This cold-blooded killing enraged cops everywhere. A later investigation indicated that an escaped radical, Joannne Chesimard, one of the most sought after individuals in America, may have been in that van.
She was serving a life sentence for her role in the murder of a New Jersey State trooper in 1973 when she escaped from custody in 1979. This theory was never proven, but to this day, many of the investigators who worked on that case believed it to be true.
http://www.trutv.com/library/crime/terrorists_spies/terrorists/brinks/10.html
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"[Bernardine] Dohrn [Bill Ayers' co-terrorist wife] once was on the FBI's 10 Most Wanted List. She served seven months in prison for refusing to cooperate with a grand jury investigating a 1981 armored truck robbery in Nyack, N.Y., in which two police officers [and 1 Brinks guard] were killed."
http://www.washingtonpost.com/wp-srv/aponline/20011101/aponline190504_000.htm