When immigration agents pulled U.S. citizen Leonardo Garcia Venegas from his car this month and shackled him, he wasn’t surprised. He wasn’t scared. He was tired. As ProPublica detailed last fall, he had already been detained twice before. A year ago, Garcia Venegas was filming his brother’s arrest during a raid on their coastal Alabama construction site when he was tackled by agents, who ignored his pleas that he was a citizen. A few weeks late…