What were the connections between ‘systems thinking’ and Nazism?

See this tweet and replies from Paul Nightingale

“The early ones were literally Nazis who were interned after the war. Concepts like Fuhrer-prinzip had to be cleaned up for US audiences.”
“Cybernetics is later. Systems theory emerged in 1930s Germany, Bertalanffy was in the Nazi party.”
“The pre war categories were often racial, while the post war US work was actively trying to purge all racial and biological characteristics from their conceptions of human agents. Which is why they are often so abstract.”