anarchist

Another one of those from-the-floor trial shots
Frank Abarno [1891-1978, (called Arbano in Times story), 22, one of the Italian anarchist bombers who plotted to blow up St. Patrick's Cathedral on March 2, 1915, and Carmine Carbone 18, the maker of the bomb:
query.nytimes.com/gst/abstract.html?res=9A00E6DB1238E633A...

news.google.com/newspapers?nid=1915&dat=19150308&...

Thanks for supplying the details and connecting it up to the related photograph and photos taken from a similar angle. We can add some information to the description when we next update.

Were they convicted?

FreeRangeBob: Here's a little more about the trial, looks like they were convicted, April 2, 1915. query.nytimes.com/gst/abstract.html?

Bresci Circle, the anarchist group www.wikidata.org/wiki/Q60839042 Frank Abarno (1891-1978) www.wikidata.org/wiki/Q19662205 Carmine Carbone www.wikidata.org/wiki/Q115259062

Ironically, they seem very well behaved.

I have trouble imagining anarchists as the sort of people who would wear straw boaters.

Other Bain photos of the Socialist Anti-War Rally in Union Square, New York City, August 8, 1914:

I stand corrected.

Real Anarchists that doesn't care about fashion. its not what you wear but what's in your mind. kill your authorities...

Alexander Berkman (November 21, 1870 – June 28, 1936) was an anarchist known for his political activism and writing. He was a leading member of the anarchist movement in the early 20th century. en.wikipedia.org/wiki/Alexander_Berkman

In Living My Life, Volume 2, Emma Goldman
books.google.com/books?id=WwLCAgAAQBAJ&pg=PA615&l...
notes that Berkman had a leg injury when he and Goldman were in court on June 27, 1917 to face charges of conspiracy to defeat the selective draft.
The date scribbled on the negative is definitely June 1917, but likely the 10th or 20th.
See Goldman in next photo:
In books.google.com/books?id=WwLCAgAAQBAJ&pg=PA599&l...
she describes Berkman's accident in mid-May 1917.

Richard Norton and swanq: Thanks for your sleuthing here. We will include more details next time we update these rexords.