"Born of war, both Bolshevism and Fascism drew their basic education from war. They transferred to politics the lessons of the trenches: familiarity with violence, the simplicity of extreme passions, the submission of the individual to the collectivity, and finally the bitterness of futile or betrayed sacrifices."
https://en.wikiquote.org/wiki/Fascism's_relationship_with_other_political_and_economic_ideologies