For over a hundred years, European and American cities were dotted with cells of left-wing radicals, Socialist and Communist groups who infiltrated more mainstream organizations, assassinated public officials, organized violent protests and detonated bombs in public places.
It was the fear of this churning red enemy that Karl Marx described in the opening of the Communist Manifesto as the specter of Communism haunting Europe.
The red cause has since gone mainstream and its bomb-throwers have become the establishment. The old radicals are parliamentarians and ministers, they head up NGOs and oversee newsrooms. They no longer haunt Europe; instead they rule Europe.