The San Francisco Board of Supervisors, presided over by president and now acting Mayor Dianne Feinstein, top left, bow their heads in silence for Mayor George Moscone and Supervisor Harvey Milk who were shot to death at City Hall in San Francisco, on Monday, Nov. 27, 1978. Through decades of political life, no issue has motivated Dianne Feinstein more than gun violence, according to current and former colleagues and members of her staff.