Even if high security was around for those later events, it was the Bader-Meinhof Group that really set Germany off to begin with. And as abhorrent as the Bader-Meinhof Group was to the majority of people on the left, its members still identified themselves as left (they definitely didn’t see themselves as on the right), and so “far-left” is a fair tag. The same is true for some of the Italian movements from the same era.