The neighbors were fed up. For days, they’d had no electricity or running water because of a massive national blackout. So one morning this week, they piled logs and garbage into a makeshift barricade in their middle-class Caracas neighborhood and started yelling slogans against the government. Then came the motorcycles. There were at least 20 of them, their motors buzzing, driven by men with scarves over their faces, according to interviews with 10 witnesses. The demonstrators scattered. But as people in surrounding buildings started hurling bottles at the bikers, the men raised their weapons — pistols and rifles — and opened fire. No one was injured. But the neighbors were terrified. “Now we can’t even protest, because they’ll shoot at us,” […]