Here's Nick Turse's years-long tussle with the NYPD, for doing - nothing, really, except really, really cheesing them off.
And just in case you think it couldn't happen here (I'm kidding, of course):
According to Dwyer, for at least a year prior to those demonstrations, "teams of undercover New York City police officers traveled to cities across the country, Canada and Europe" to conduct covert surveillance of activists.I don't believe for a minute that this was done without the knowledge of Canadian governments and law enforcement agencies. Not only did they know about it, they probably helped.
All for our security, of course. Question is, who do we need protecting from? And who do we go to when we need protecting from our government and police?