During WW2 Germany different symbols were used to identify those deemed threats to the state.
The yellow star identified Jews. Amazingly enough today in America there's a new identification movement. They identify Jews with a blue rectangle.
At first concentration camps were meant for non-conformists. Thought reeducation camps,as it were.
In America we have sensitivity training centers. Thought reeducation centers.
Those who don't learn from history...