It finally happened. The Federal Trad Commission sued Amazon in federal court this week.

The Seattle company has been in the crosshairs of federal regulators for years; and the suit has wide reaching implications for the online retail, cloud computing, grocery and entertainment giant.

This is the biggest test yet of Khan’s vision for a more progressive antitrust enforcement agenda – what critics have knocked as “hipster antitrust.”

But the 172-page complaint is more rooted in tradition than some had predicted.