That’s Madison Square Garden, to be specific. This is a short video produced and directed by Marshall Curry documenting a 1939 pro-Nazi demonstration held in New York’s Madison Square Garden. It was attended by some 20,000 New Yorkers (what? you say they were all from New Jersey?) and, yes, by a few 1930s vintage “antifas”.
We’re a divided nation these days, but that, by itself, is nothing new.
For more information about the film and the history, check the video’s web site.