David Kravets highlights a new ACLU report (.pdf) that provides "an outline of, and links to, dozens of examples of Cold War-era snooping in the modern age":
At a California State University, Fresno lecture on veganism, six of the 60 in attendance were undercover officers from the local and campus police. The Oakland Police Department in California had infiltrated a police-brutality demonstration, and its undercover officers selected “the route of the march.” ... A Kentucky minister was detained at Canadian border trying to enter the United States because he had purchased copies of the Koran on the internet following the 2001 terror attacks. A New York, Muslim-American student journalist was detained for taking pictures of Old Glory outside a Veterans Affairs building as part of a class project.
(Image by Will Varner)