The raids by 20 police forces armed with 67 warrants happened simultaneously in Ontario, Alberta and British Columbia and included the Canada Border Services agency and the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives, the National Post reported.
The massive pre-dawn sweep was organized by Toronto police. The project began in May and was dubbed Project Marvel, the Canadian Broadcasting Corp. said.
In a release, police said the sweep included suspects in organized crime, attempted murder, firearms trafficking and importing, robbery, prostitution and various other offenses, the CBC said.
Toronto police Chief Bill Blair and Superintendent Chris White of the Organized Crime Unit said at a news conference later in the day that the Young Buck Killaz and the G-Siders gangs were plaguing the Toronto area and were expanding their activities across the country, the Toronto Star reported.
Besides the dozens of arrests, police said they seized weapons, cash and drugs, the Star said.
The Globe and Mail reported the raids took place in Ontario, Quebec, Alberta and British Columbia.
Blair said the investigation that led to the raids and arrests "revealed a level of mobility among street gangs not yet witnessed before in this city."