On a drizzly October morning, Sara Matsuzaki, a Portland-area mother of three, was still recovering from giving birth three weeks ago. Her partner was leaving for work when federal agents showed up in the couple’s front yard and arrested him. “The boys saw the whole thing,” Matsuzaki said, referring to her two- and four-year-old sons, who followed her out into the rain when she went to talk to one of the agents with Immigration and Customs Enforcement.