He had a few dojo in Harlem and hosted a full contact - no padding event at the NY Ballet Theatre I believe it was in NYC in 1975. It was an entertaining and brutal event. (I was there 8th row center and paid a whopping 30$ for a ticket, big money back then for a teenager.) There were quite a few folks from the Harlem, Bronx and Brooklyn full contact dojo competing in the event.
His younger students could do some amazing physical stuff and they were brutally hard fighters.
There was some serious blood at that event and what was weird was they would just jump out with a mop and bucket and wipe up the stage and continue.
Some guy from LI NY (can't remember his name but was wearing a hapkido uniform) stepped up to compete and this guy that was famous for doing "the robot" moves in his kata in those days hit him twice and there was blood all over the place and the guy was down for the count.
Hamilton was a veteran I know because he used to come into the place I worked in St.Albans. Hard man to forget.
There was a lot of USA Goju, Nisei Goju (an offshoot school of the USAGJR who spawned Louie Delgado) and Shotokan besides Aaron Banks groups up on that end of the Manhatten Island in those days....
I only remember him as a terribly polite man with amazing students.
Raymond McRinna claims to have trained with him directly. Could get more info from him...
http://www.usakarate.org/contacts.html and possibly the other gentleman that is listed on the site from "original karate dojo" Samad Raatib.
Hope thats some help...
Kent