Amid the Trump administration’s immigration crackdown in the Twin Cities, federal agents have threatened to arrest onlookers, following through on that threat at least once. Social media is also full of videos of civilian watchdogs blowing whistles and honking car horns to alert others as agents attempt to stop or detain people they believe to be illegal immigrants. One of them is Lucia Webb, who was boxed in and confronted by Immigration and Customs Enforcement agents after following them in her car last week.