The opposition leader Leopoldo López addressed thousands of supporters in Caracas on Tuesday before giving himself up to the authorities. Meridith Kohut for The New York Times CARACAS, Venezuela — A prominent Venezuelan opposition leader surrendered to the authorities on Tuesday in the midst of a large crowd of supporters who tried to block his arrest on accusations that he was responsible for violence that erupted during recent antigovernment protests. Before giving himself up, the opposition politician, Leopoldo López , walked through a sea of thousands of supporters in the largest rally in more than two weeks of growing protests fueled by discontent over runaway violent crime, a stalled economy, government pressure on the news media and other issues. “We are living in a dark time when criminals are rewarded and they want to imprison the Venezuelans who want peaceful, democratic change,” Mr. López said, standing on the base […]