595 people were arrested on Tuesday at a Mississippi plant on illegal immigration charges.  According to Reuters, the investigation centered around identity theft issues and the use of fake social security cards by the laborers.

From Reuters:

U.S. immigration agents have arrested 595 people at a Mississippi factory in what was the largest workplace enforcement raid in the United States to date, an immigration official said on Tuesday.

Immigration and Customs Enforcement spokeswoman Barbara Gonzalez said federal agents arrested the workers in a raid at the Howard Industries Inc. factory in Laurel, Miss, on Monday,

“This is the largest targeted workplace enforcement operation we have carried out in the United States to date,” Gonzalez told Reuters by telephone.

The swoop at the plant, which makes electrical equipment including transformers, was part of an ongoing investigation into identity theft and fraudulent use of Social Security and for illegal immigrants.

The nationalities of the detainees was not immediately available.