I think most people don't remember that US postal inspectors used to primarily concern themselves with the distribution of erotica. And most people probably still don't wonder "gee, why is the USPS able to email me a picture of whatever I'm about to get in my mailbox?" Answer: the USPS stores a high resolution, high-dynamic-range image of every single piece of mail that passes through a high-speed sorting machine. And let's just say that you should try opening up some of those images in an image editor and mess with the curves/levels...
Hoover's FBI was spying on damn near anyone who had a remotely liberal viewpoint. If your parents are dead, submit a records request to the FBI to find out if they had an FBI file. Decent chance that if they were liberal, the FBI has something on them. Here's another fun fact: a huge number of FBI agents are Mormons. Our FBI is infested with Christian religious cultists. The idiots who show up on your doorstep to try and preach their religious values. Those people. They become FBI agents.
During the "occupy wallstreet" era state cops posted a photo on social media from inside the state's "command bunker", of a projector screen showing the output from a laptop displaying some sort of live status map or the like. I don't remember what the event was. It was a web page. In the browser bookmark bar was the facebook page for the city's "Occupy Wallstreet" facebook group along with another group that was clearly a liberal/progressive FB group. The state has a surprising number of violent white supremacists and curiously, none of those were in the browser bar...
Many years later, right around the time of the George Floyd protests - someone near a college campus snapped photos of university cops loading one of their patrol vehicles - a pickup truck - with bricks - in a back alley.
They came up with some laughable excuse that their sharp-eyed officers spotted a bunch of loose bricks in a sidewalk a full block from University property and decided to scoop them all up to do a favor for the city. Riiiiiiiiiiiiight....