When flower power met tank tread

In my latest video for the Rebel, I argue that when the Soviet Union invaded Czechoslovakia on August 20, 1968, and crushed the "Prague Spring", it provided a sobering reminder at the height of the counter-cultural revolution, that there was a crucial difference between the open societies of the West and their enemies abroad. https://www.youtube.com/watch?v=OMUgVdiouZI