The federal E-Verify system is supposed to help employers determine whether their workers are legal, but its use isn't always required.

Behind the shocking sight of hundreds of South Korean workers being chained and detained at a Georgia battery factory is the Trump administration's other target: companies that hire illegal workers.

While President Donald Trump has launched sweeping immigration raids on a promise to deliver the largest mass deportation in history, administration officials are also taking a harder line against employers they say cheat American workers by hiring undocumented immigrants.

Since 1986, employers have required to verify workers' eligibility to work, and can be fined or jailed if caught knowingly breaking the law. But enforcement has typically focused o

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