Canadians should heed the uproar in the United States, Europe and Latin America over the recent revelations that the National Security Agency (NSA) is spying, without warrants, on e-mails, faxes and telephone calls going into and out of or simply transiting through the country. The fear is that data collection and data-mining systems used by the NSA are not just monitoring suspected terrorists, but also filtering through the international, and possibly even domestic, communications of potentially all ordinary law-abiding citizens. What is even more startling is that Canadian security agencies have been authorized to do the same thing here, and may be using the same approach to conduct vast data-mining of our communications.