San Francisco -- A member of a notoriously violent street gang was arrested and booked Wednesday on three counts of murder in the shootings of a San Francisco father and two sons in the city's Excelsior district that police believe stemmed from a minor traffic incident, authorities said. Edwin Ramos, 21, of El Sobrante was arrested at 12:05 a.m. at his home on the 4300 block of Hilltop Drive in the Sunday slayings of Tony Bologna, 48, and his sons Michael, 20, and Matthew, 16, authorities said. At 5 p.m., he was booked on the murder charges. Police recovered a...