The resignation of National Security Adviser Michael Flynn on Monday evening raises troubling questions about the role of the Federal Bureau of Investigation (FBI) and the intelligence services. Flynn ostensibly resigned because he provided Vice President Mike Pence with “incomplete information” about a conversation he had with the Russian ambassador, which turned out to include a discussion of recent sanctions, contrary to his earlier denials. Trust is crucial; the resignation was warranted. That said, the sanctions were largely bogus, and were applied not just to punish Russia for spying on the U.S. (both countries clearly spy on each other), but...