"In June 2005, two Chinese defectors in Australia claimed that China had more than 1,000 spies and informants in Canada. One former CSIS agent gave the claim some credibility, saying billions are being lost in the theft of scientific and commercial data. And in 2002, Ottawa expelled two Russian military attachés on suspicion of espionage."
really?
http://www.cbc.ca/news/background/cdnsecurity/cdn-spies.html
