I never saw this before in my life. I notice they have the old uniforms on. I remember seeing " Bill Groll " skate in person in Chicago at the UIC Pavillion.
It must have been during the Era of Disco. Because you look at those satin clothes the Slammers had on and hear the Music of the " Star Wars " Movie, that was the Era of Disco.
The red uniforms were used by The California Red Devils of the United Banked Track Roller Training Association in 1975. Your mileage may vary, but the existing footage from that league is some of my favorite action.
😆Ha,ha,ha! They have a color camera and then switch to like a black and white security camera for some reason. In the past, commentators used to say " If you missed any of the action. That was the reason to come out and see it in person. "
