February 16, 1970 at 10:45 p.m - Golden Gate Park branch of the San Francisco Police Department in the Upper Haight neighborhood of San Francisco: A bomb that had been planted on the ledge outside a nearby window went off. (Address - 1899 Waller Street, San Francisco, CA, 94117 (Intersection of Waller Street and Kezar Drive)

Brian V. McDonnell, a sergeant with the San Francisco Police Department who received fatal shrapnel wounds from a Weatherman pipe bomb set off on February 16, 1970.In a bombing that took place on February 16, 1970, and that was credited to the Weathermen at the time, a pipe bomb filled with heavy metal staples and lead bullet projectiles was set off on the ledge of a window at the Park Station of the San Francisco Police Department. In the blast, Brian V. McDonnell, a police sergeant, was fatally wounded while Robert Fogarty, another police officer, received severe wounds to his face and legs and was partially blinded.

Weatherman leader Bernardine Dohrn has been suspected of involvement in the February 16, 1970, bombing of the Park Police Station in San Francisco. At the time, Dohrn was said to be living with a Weatherman cell in a houseboat in Sausalito, California, unnamed law enforcement sources later told KRON-TV. An investigation into the case was reopened in 1999, and a San Francisco grand jury looked into the incident, but no indictments followed, and no one was ever arrested for the bombing. An FBI informant, Larry Grathwohl, who successfully penetrated the organization from the late summer of 1969 until April 1970, later testified to a U.S. Senate subcommittee that Bill Ayers, then a high-ranking member of the organization and a member of its Central Committee (but not then Dohrn’s husband), had said Dohrn constructed and planted the bomb. Grathwohl testified that Ayers had told him specifically where the bomb was placed (on a window ledge) and what kind of shrapnel was put in it. Grathwohl said Ayers was emphatic, leading Grathwohl to believe Ayers either was present at some point during the operation or had heard about it from someone who was there. In a book about his experiences published in 1976, Grathwohl wrote that Ayers, who had recently attended a meeting of the group's Central Committee, said Dohrn had planned the operation, made the bomb and placed it herself. In 2008, author David Freddoso commented that “Ayers and Dohrn escaped prosecution only because of government misconduct in collecting evidence against them”.

Reagan said the witnesses’ descriptions of the meetings were consistent with each other and strikingly similar to other Weather Underground planning sessions he had personally attended while an undercover agent. The idea, he added, was to implicate all members in a criminal conspiracy, reducing the chance that anyone would turn to the police. “It’s almost like the Mob, when they ask someone to kill somebody or hack a guy’s arm off. They trust you more when they’re dirty with you.”

Weather Underground disguise wigs found in the Pine Street safe house

Action in San Francisco one month BEFORE apartment on Pine Street is rented:

February 16, 1970 - San Francisco Park station bombing.

Clinton Everett Willard and Robert Pearson White (Clayton Van Lindgraf) rented an apartment on Pine Street in SF in April 1970 for one year ending March 1971.

Finger Prints found by FBI in PIne Street "Bomb Factory"  (just a few blocks away from the San Francisco Park station) in April 1971 after owner said it was abandoned.

Kathy Boudin - 1969 to Cuba /1970 Greenwich Village explosion /1981 Brinks robbery get away car
David Gilbert - Kathy Boudin's husband / get away car in 1981 Brinks robbery
Bill Ayers - who later adopted David Gilbert and Kathy Boudin's son
Mark Rudd - 2009 formed MDS (new SDS) working with Kathy Boudin's son / Terry Robbins told him about Ft.Dix plan (Greenwich Village explosion)
Cathlyn Wilkerson - escaped 1970 The Greenwich Village explosion / 1980 (July) surfaces in New York
Howard Machtinger - signed on-line petition for Ayers in 2008 
Julie Nichamin 
Peter Clapp
John Willard Davis
Naomi Esther Jaffe
Michael Thomas Justesen
Jeffrey David Powell
Sheldon Rosenbaum
Michael Louis Spiegel
Lawrence Michael Weiss
Karen Lynn Ashley

Actions in San Francisco after apartment on Pine Street is rented in April 1970:

May - The WUO releases its "Declaration of a State of War" 
July -The United States Army base at The Presidio in San Francisco is bombed.
June - Credit for the bombing of the San Francisco Hall of Justice (no explosion had occurred.)
September - The WUO helps Dr. Timothy Leary escape from the California Men's Colony prison.
October - 1970 - Bombing of Marin County courthouse.

Actions in San Francisco after apartment on Pine Street is abandoned in April 1971:

1970 - Aug - Bombing of the Office of California Prisons
1974 - Bombing of the Department of Health, Education and Welfare offices 
1974 - The Office of the California Attorney General is bombed
1977 - Bernardine Dohrn first child born
1977 - Plot by the Weathermen to bomb the office of John V. Briggs
(1977 to 1979 Dohrn and Ayers go to NYC)

Mark Rudd became a member of the Columbia University chapter of Students for a Democratic Society (SDS) in 1963. By 1968, he had emerged as a leader for Columbia's SDS chapter.

Mark Rudd had been contacted by the FBI about the February 16, 1970 San Francisco Park bombing but he refused to cooperate with the FBI. His finger prints, along with Bill Ayers, had also been found in the Weathermen's "Pine Street Bomb Factory" after the bombing. Asked why his fingerprints had been found in an apartment in San Francisco that the FBI had labeled a bomb factory (with bomb-making paraphernalia) Rudd said he had only been living in the place for a while. But in answering the question, he repeatedly referred to the “apartment” as a “factory,” only to catch and correct himself.

The BLA (Black Liberation Army) connection to San Francisco Park station may be a red herring - or it could mean that McDonnell’s murder was simply the result of two militant groups working in tandem. A prime tenet of the Weathermen’s through-the-looking-glass revolutionary doctrine was that it was their duty to shed “white-skin privilege” and put themselves at the service of black radicals, and there are indications that the affinity between the BLA and Weathermen was particularly strong.

In the mid-1970s, years after Steen spoken to the FBI, another former Weather Underground member Latimer came forward to say that she had attended a separate planning session for the Park station attack, with Dohrn and Machtinger in the winter of 1970. (In the months leading up to the bombing, Dohrn was living on a houseboat in Sausalito, just across the Golden Gate Bridge from San Francisco, according to an account in A Radical Line, the family memoir of Thai Jones, son of former Weatherman Jeff Jones.)

Latimer calmly narrate the planning of the Park station attack, step by step, the local detectives knew they finally had a break. In fact, they believed she could make their whole case. Latimer claimed to have personally cased the station, and could describe the package that had held the explosive device before it went off. “It was just too detailed,” the investigator familiar with the case said. “It was A to Z without leaving out L and M. I was convinced.”

Latimer later dies of mysterious circumstances...