It took one text message to turn Maria Murillo’s world upside down. It was from her husband, a gardener on a landscaping job on a balmy weekday morning in La Mirada, she said. “I’m (expletive)ed…,” it read, but in Spanish. A video from the scene that June 18 morning showed why, according to the family. It appears to show federal agents parked curbside in a blue SUV, alongside a La Mirada sidewalk. Moments later, the video showed what appears to be two agents escorting a man to a vehicle. “Excuse me, but what’s your name, so your family can know,”...