This video from the USA says about itself:
Cops Accidentally Admit They’re Spying On Left-Wing Groups
22 September 2018
The Massachusetts State Police accidentally revealed surveillance of progressive political groups in a social media post on gas explosions in Lawrence, North Andover and Andover, WBUR reports.
The police posted an image of 39 gas explosion locations. But the screengrab of the police computer included the browser’s bookmarks bar.
The post showed police had booked pages for Massachusetts Action Against Police Brutality (MAAPB), the Coalition to Organize and Mobilize Boston Against Trump (COMBAT), and other activist organizations.
Read more here.