The Federal Trade Commission and the Antitrust Division of the U.S. Department of Justice have issued guidance signaling their interest in further cracking down on companies that make agreements with others that have the effect of limiting employees’ mobility or keeping their wages down.

The guidance issued by the agencies earlier this month to human resource professionals and others involved with hiring and compensation clarifies that so-called no-poaching and wage-fixing agreements between employers are violations of antitrust law, potentially punishable with criminal charges.