A federal grand jury has indicted five current and former Mambo Seafood managers and supervisors, accusing them of knowingly employing illegal immigrants and charging that they went as far as allowing workers to change identities and Social Security numbers.

The five-count indictment, unsealed on Thursday, outlines a conspiracy that dates back more than two years and involves current and former employees at the Houston restaurant chain, which is also known as Connie's Seafood Kitchen Inc.