It was known as Operation Gladio and (Officially) ran between 1956 and 1990, during the course of which nearly every European country had a neo-Nazi terrorist group armed and trained by the CIA, NATO and often their own intelligence agency. They started with the notion of being stay-behind in case of Communist invasion or victory in the elections, but then shifted their strategy to trying to crush the broad Left (socialists, communists of all stripes and Anarchists) by both directly attacking us and by carrying out terrorist violence and having their friends in the police blame it on us. In Italy, where we know the most about the operations of Gladio, they carried out dozens of terrorist attacks, killing and maiming hundreds and leading up to the Years of Lead as the Left responded to the violence by defending itself. But Italy was not their only area of operations - there was a branch in most European countries, and there has not been sufficient research to establish exactly what these groups did. In Sweden, where I'm from, the local branch is suspected of being Legion Wasa, but we simply don't know because there has never been an inquiry of any kind, for example. But this might very well be the link explaining how Nazis got a hold of a bunch of millitary hardware that they used to launch a spate of robberies and murders, as well as tossing handgranades at offices and members of my union, the syndicalist SAC.
Again, we'll never know if NATO was the reason my political beginnings was carried out in an atmosphere of fear and defensiveness, but the fact that it might have been is in itself remarkable. Whatever the truth of that, we do know for a fact that they've injured and murdered hundreds, and from the only country where this was ever properly researched.