Watch Free Online on Hurawatch. It’s been a decade since Postville, a small town in Iowa, suffered the largest immigration raid at a worksite in U.S. history: 389 immigrants were arrested in the biggest kosher meatpacking plant in the country. As Donald Trump revives some aspects of George W. Bush’s immigration enforcement policies, the Postville experience sheds light on the impact, efficiency and repercussions of massive worksite raids.