Actually, that sounds more like any of a number of Soviet-bloc countries during the Cold War.
That is, unless actual water cannons (Bull Connor's goons walking with live fire hoses doesn't count) were standard equipment in pre-1964 America.
We're not in the Soviet Bloc. We're in the United States of America. When one indicates using water cannons and German shepherds on people in the modern context, it undoubtedly will conjure images of their employment on people during the Civil Rights Era. Something WELL more document and viewed, in American homes, than Eastern Europe protests. Surely, I don't need to explain that you?