A city police officer throws a hat full of water on exuberant strikers while another officer controls a scuffle on the right in Ottawa, Wednesday, August 11, 1971. Violence erupted in the early morning as 92 striking collectors were joined by 200 sympathetic tradesmen on the picket line. During the dispute, Ottawa Disposal Systems Ltd. garbage trucks were driven by non-union employees. THE CANADIAN PRESS/Peter Bregg