Go to google news (in a bar at the top left of the google page. You will find a story from the Montreal Gazette. The Canadian government has opened a web site, warning Canadians about terrorist organizations - some by name, and some just by type of organization. All will be under constant investigation by the Canadian authorities.
One of the generalized categories is....wait for it......
Under Bush, the President got the power to imprison American citizens without charge or trial. He also got the power to order, with reason, any American citizen in a foreign country. Under Bush, he extended surveillance to include anybody who disagrees with the government - especially including peace groups. Under Bush, the US invaded Iraq and Afghanistan. Under Bush, torture became a legal practice. I think that is the definition of a police state.