"(Also last week,) the USPS revealed that its postal inspectors have been monitoring social media at random, looking for troublemakers. Since social media is publicly posted, you and I can read it at will. But the Fourth Amendment requires that the government have "articulable suspicion" about the person whose social media is being surveilled before it begins its surveillance — even surveillance of publicly available materials. This is to prevent fishing expeditions."
"What articulable suspicions did the Postal Service have before its police began their surveillance? What conceivable threat to the postal mails is manifested in texts and emails (other than that the latter are infinitely faster and profoundly more efficient)? None and none."
Here is a bit of domestic spying history from the Judge; https://www.lewrockwell.com/2021/05/andrew-p-napolitano/more-government-spying-and-lying/