THE UGLY INTERSECTION OF PARANOIA, BIGOTRY, AND MCCARTHYISM…. It’s almost as if right-wing House members want to be made fun of.

Republican members of the Congressional Anti-Terrorism Caucus said the Council on American Islamic Relations (CAIR) have tried to plant “spies” within key national-security committees in order to shape legislative policy.

Reps. Sue Myrick (R-N.C.), John Shadegg (R-Ariz.), Paul Broun (R-Ga.) and Trent Franks (R-Ariz.), citing the book Muslim Mafia: Inside the Secret Underworld that’s Conspiring to Islamize America, called for the House sergeant at arms to investigate whether CAIR had been successful in placing interns on key panels. The lawmakers are specifically focused on the House Homeland Security Committee, Intelligence Committee and Judiciary Committee.

“If an organization is connected to or supports terrorists [and] is running influence operations or planting spies in key national security-related offices, I think this needs to be made known,” said Broun, who sits on the Homeland Security Committee. “So I join my colleagues here today in calling for action.”

It’s as if they’re handing out crazy pills in the cloak room.

The book Myrick, Shadegg, Broun, and Franks are relying on was published by WorldNetDaily, a radical fringe website that recently “reported” that the Obama administration is considering Nazi-like concentration camps for dissidents.

The book’s co-author’s son pretended to be Muslim to infiltrate the not-so-nefarious organization as an apparent intern. (Put another way, “the dastardly plot to plant Muslim interns as spies on the Hill was uncovered by an intern acting as a spy.”) The book’s co-author’s son alleges that CAIR — an entirely legitimate, mainstream advocacy group, that is not “connected to” terrorists — is secretly plotting, using fake interns as pawns in some elaborate scheme.

So, do Myrick, Shadegg, Broun, and Franks know of any intern/spies CAIR has sent to Capitol Hill? Actually, no, but they heard about this book and want an investigation anyway.

Honestly, I get the sense that some of these guys are getting dumber as time goes on.

As for “infiltration” of CAIR, the man who pretended to be a Muslim and an intern apparently took as many documents from the organization as he could during his time there, and discovered that the lobbying group intends to do “ordinary lobbying work on Capitol Hill.” When Myrick, Shadegg, Broun, and Franks released an internal CAIR “strategy” document yesterday, they unveiled “a fairly straight forward public relations and lobbying strategy.”

At the intersection of paranoia, bigotry, stupidity, and McCarthyism, it isn’t pretty.

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.