The US Supreme Court’s Slaughter ruling on Monday, which overturned longstanding precedent called Humphrey’s Executor, is seriously bad news for American companies who handle Europeans’ personal data. That’s because the ruling destroyed the independence of the Federal Trade Commission (FTC), which is an essential part of a deal that enables transatlantic data flows. And now Max Schrems, who blew up that deal’s predecessors, is going in for the kill.