Among the flood of books marking the 50th anniversary of JFK’s assassination is “The Man Who Killed Kennedy: The Case Against LBJ,’’ which claims that Lyndon Johnson was the mastermind behind the Crime of the Century. It’s co-authored by Roger Stone, a sleazy Republican operative renowned for his dirty campaign tricks, fancy wardrobe and swinging lifestyle.

Stone and I were freshman classmates at George Washington University in 1970-71. During a time when many students had pictures of Che Guevara and Karl Marx on their dorm walls, he had posters of Barry Goldwater, Richard Nixon and Ronald Reagan. He also dressed like a preppy, wearing sports jackets and ties while the rest of us were slumming it in jeans and T-shirts.

Naturally, my friends and I tortured him. One night, a Harley-riding Charles Manson lookalike snuck into Stone’s bed while he was sleeping and waited for him to roll over and discover – to his horror – that he had his arms wrapped around a bearded stranger.

We also called him and solicited donations for phony political groups like Young Republicans for Bestiality and Pedophiles for Reagan. He would listen for a minute or so before denouncing us as perverted heathens.

One other thing: I vaguely remember dangling him from an eighth-floor window and threatening to drop him if he didn’t swear allegiance to the Socialist Workers Party. He refused, which showed he had principles if not common sense.

I lost track of Stone after my freshman year, but he later turned up as a bit player in the Watergate scandal (he has a tattoo of Nixon on his back) and went on to become a key Republican strategist. He worked on presidential campaigns for Nixon, Reagan, Jack Kemp, Bush I and Bob Dole, and was involved in a bunch of congressional and gubernatorial races. He also helped Bush II by organizing protests against the Florida recount following the 2000 presidential election.

Last year, Stone ditched the Republicans and joined the Libertarian Party, which made sense for a guy who has admitted going to swingers clubs and taking out ads seeking sex partners for him and his second wife.

And now he has supposedly solved the JFK assassination. I think I’ll send him a congratulatory message on behalf of Young Republicans for Bestiality.