I remember that show from my youth! When we first got a TV back in 1956 it was the first show on. First time I ever heard about Communists.
“American Citizen, Communist, counter-spy!”
Ok, I do remember an earlier serial at the theater in which evil “foreign” sounding men were setting up in Canada to start “The bombardment of American cities”. But the Mounties were on the case!
Not knowing if the Mounties are mentioned or not, but you might be remembering
FOREIGN INTRIGUE
https://www.youtube.com/watch?v=O9tJwxNSPLg&list=PLehwzgbsMqvWiyK4NEmOh99amXnkbeKkx
Seem to remember a tv show featuring Canadian Mounties, but no lights on as to the name of the series.
ROYAL CANADIAN MOUNTED POLICE
(RCMP)
https://www.youtube.com/watch?v=Ge21NjzMOOw
You might try this site for the Canadian shows.
http://ctva.biz/Canada/RCMP.htm