City police station. The FBI placed the Weather Underground organization on the ten most-wanted list by the end of 1970. Activity in 1970 On June 9, 1970, a bomb made with ten sticks of dynamite exploded in the 240 Centre Street headquarters of the New York City Police Department. The explosion was preceded by a warning about six minutes prior to the detonation and was followed by a WUO claim of responsibility. On July 23, 1970, a Detroit federal grand jury indicted 13 Weathermen members in a national bombing conspiracy, along with several unnamed co-conspirators. Ten of the thirteen already had outstanding federal warrants. In September 1970, the group accepted a $20,000 payment from the largest international psychedelic drug distribution organization, called The Brotherhood of Eternal Love, to break LSD advocate Timothy Leary out of a California prison in San Luis Obispo, north of Santa Barbara, California, and transport him and his wife to Algeria, where Leary joined Eldridge Cleaver. Rumors also circulated that the funds were donated by an internationally known female folk singer in Los Angeles or by Elephant's Memory, which was John Lennon's backup band in New York City and was a factor with the attempted deportation of Lennon, who had donated bail money for radical groups. In October 1970, Bernardine Dohrn was put on the FBI's Ten Most Wanted List. United States Capitol bombing On March 1, 1971, members of the Weather Underground set off a bomb on the Senate side of the United States Capitol. While the bomb smashed windows and caused hundreds of thousands of dollars' worth of damage, there were no casualties. Pentagon bombing On May 19, 1972, Ho Chi Minh's birthday, the Weather Underground placed a bomb in the women's bathroom in the Air Force wing of the Pentagon. The damage caused flooding that destroyed computer tapes holding classified information. Other radical groups worldwide applauded the bombing, illustrated by German youths protesting against American military systems in Frankfurt. This was "in retaliation for the U.S. bombing raid in Hanoi." Withdrawal of charges In 1973, the government requested dropping charges against most of the WUO members. The requests cited a recent decision by the Supreme Court of the United States that barred electronic surveillance without a court order. This Supreme Court decision would hamper any prosecution of the WUO cases. In addition, the government did not want to reveal foreign intelligence secrets that