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What youre looking at is the 1939 "Pro-American Rally" (aka Pro-Nazi Rally) sponsored by the German American Bund at Madison Square Garden on George Washingtons 207th Birthday. Banners emblazoned with such slogans as Stop Jewish Domination of Christian Americans, Wake Up America. Smash Jewish Communism, and 1,000,000 Bund Members by 1940" decorated the great hall.
New York City Mayor Fiorello LaGuardiaan Episcopalian with a Jewish motherconsidered canceling the event, but ultimately he, along with the American Jewish Committee and the American Civil Liberties Committee decreed that the Bund was exercising its right to free speech and free assembly.
A crowd of 20,000 filled the famous sports venue in mid-town Manhattan to capacity. 1,500 police officers were present to render the Garden a fortress impregnable to anti-Nazis. An estimated 100,000 counter-demonstrators were gathering outside.
Police Commissioner Lewis J. Valentine bragged to the press that we have enough police here to stop a revolution.
The most disturbing moment in the short film comes at the 3:50 mark, when another security forcethe Bunds Ordnungsdienst or "Order Service pile on Isidore Greenbaum, a 26-year-old Jewish worker who rushed the podium where bundesführer Fritz Julius Kuhn was fanning the flames of hatred. Valentines men eventually pulled them off, just barely managing to save the anti-Nazi from the vicious beating he was undergoing.
Reportedly he was beaten again, as the crowd inside the Garden howled for his blood.
More:
http://www.openculture.com/2017/10/20000-americans-hold-a-pro-nazi-rally-in-madison-square-garden-in-1939.html