The beauty (or the terror, depending on your perspective) of the Justice Department’s Antitrust Division is that you never know where it’ll strike.

One minute the feds are taking down multi-billion dollar international cartels. The next, they’re busting players in an industry that sounds more like a Downton Abbey plot device: heir location services. That is, companies that specialize in scouring legal notices for intestate estates, then tracking down the long-lost heirs—for a cut of their inheritance.