In 1956 or 57, the “Zengakuran Students Federation” a Communist front organization, snaked danced past our house, across the street from the base at Yokohama. They spotted by dad's Packard, closed in on it and got it flipped over on its top. It was then set on fire.
As a parting gift, they painted a hammer and sickle on our front door.
Been there...
You were a dozen odd years ahead of me. I was in Sasebo at Fleet Activities Base attached to ComServGru3.
I don’t remember any violence connected to the snake lines in Sasebo. My recollections are that these young Japanese were just having fun more than anything.