OAKLAND, Calif., Aug. 3 — A day after a prominent newspaper editor was shot to death downtown, the police here on Friday arrested seven men and seized several weapons that they suspected were used in his killing and those of two other men. Oakland police officials said they suspected that the men were part of a group operating “a very violent criminal enterprise” out of a neighborhood bakery. The arrests came after a predawn raid by SWAT teams at the bakery, the Your Black Muslim Bakery, and three bakery-owned properties, where the police found several firearms, including the gun they...