The FBI is investigating the owner of three suburban Kyoto Japanese Steakhouse restaurants, alleging he housed at least a dozen undocumented immigrants in "substandard" living conditions and had them driven to and from his restaurants to work illegally, according to new court filing in U.S. District Court in Detroit.

Prosecutors allege the businessman let the undocumented immigrants live in his Royal Oak and Shelby Township homes rent-free, in exchange for them working in his restaurants, where they allegedly worked 12-hour days.

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