WASHINGTON — An undocumented man from Guatemala who has leukemia postponed chemotherapy because he was afraid to go to the hospital. A Mexican grandmother packed most of her belongings into boxes, in case she is deported. A Pentecostal church in East Los Angeles has lost nearly half of its in-person membership. Across California and the U.S., immigrants are responding to the Trump administration’s unrelenting enforcement raids by going into lockdown. Activities that were once a regular or even mundane part of life — taking kids to school, buying groceries, driving — have become daunting as immigrants who lack legal authorization...