Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

In July 1934, this city was the location of "Bloody Thursday" when the longshoremen's union fought against rivals for employment. In 1975, it was where Squeaky Fromme attempted to assassinate Gerald Ford. In 1945, a two-month (*) conference in this city designed the United Nations, and in 1978, Dianne Feinstein became its mayor when former politician Dan White killed George Moscone and Harvey Milk. For 10 points, name this city which, in 1989 and 1906, suffered large earthquakes.
History