Iowa voters hold the nation's first presidential caucuses one month from now. A visit to Marshalltown, Iowa, shows the impact of immigration — one of the key issues in the presidential campaign — on everyday lives.
The Swift and Co. packing plant, the small city's biggest employer, attracts immigrants from Mexico and elsewhere. Last December, federal immigration agents moved in and many undocumented workers were deported.
Others were convicted of identity theft. They'd gone to work using other people's names and Social Security numbers.
The company itself has not been prosecuted. But a federal grand jury has since indicted an American who allegedly advised the workers how to evade authorities.