fanatism
Fanaticism in English.
fascists march
Yes. The Warsaw march was organised by Robert 'stupid boy' Bąkiewicz, the leader of the fascist ONR, and the Kalisz fascist march resulted in the ringleaders being arrested due to the ringleaders burning a copy of the Statute of Kalisz and participants chanting "death to `Jews".
Olszanski is not part of any serious nationalist organizations
There are no 'serious' nationalist organisations, however Olszanski is one of the organisers of the Kalisz fascist march and for that has been arrested.
Nevertheless there is hope. the Mayor and Council in Kalisz organised and took part in an official anti-fascist march, and Bąkiewicz will forever be remembered for the words addressed to him by the war hero Wanda Traczyk-Stawska who said (trans) "Silence, you stupid boy! Shut up, you lout! Because I am a soldier who remembers how blood was shed, how my comrades died. I am here to cry out on their behalf. Nobody will ever lead my homeland out of Europe."
youtu.be/tpL0AuVHfCI