It is the latest in a series of similar charges against the activist, though she is yet to receive a binding conviction.
Polish nationalism is more varied than outsiders often think.
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This year’s march was made an official state event by the government for the first time.
After courts effectively banned the event, the justice minister called for organisers to show “civil disobedience”.
Warsaw’s nationalist Independence March in doubt after courts give anti-fascist event right to route
The organiser says it will go ahead anyway despite not being registered.
“Stop financing fascism”: public figures appeal to Polish government after grants to far-right groups
The culture ministry’s “Patriotic Fund” has awarded large grants to far-right groups, including the organisers of the Independence March.
But the government has defended the event and blamed “provocateurs” for the clashes.
The march had been banned by the mayor of Warsaw.
The detained man is the publisher of a “Lone Wolf Guide” that “promotes a fascist system and incites ethnic and religious hatred”, reports Do Rzeczy.
Police say that their preemptive action helped to ensure the event passed safely.
Join us for live updates on Polish Independence Day, including the controversial march in Warsaw.
Stanley Bill looks into the 11 November March of Independence, how it has been covered, the government’s support for it, and the spectre of radical-right wingers in Polish politics.