The Anti-Capitalist Brigade started gathering early on May Day at Oakland’s Snow Park. There was free coffee, oatmeal, doughnuts, fliers with the day’s agenda and plenty of pot. A “street medic” — “I just finished a wilderness first-aid course,” he told me when I asked about his training — tended to his first case of the day, a man in his 20s whose leg had been beaten to a purple hue with a metal rod in an overnight fight in the park. Nearby, an organizer reminded protesters to take down the toll-free number for the National Lawyers Guild: “This is important.