@failedLyndonLaRouchite Don't forget the #PhonePhreaks who got their kicks tripping up telephone exchanges by sending their own 2600 Hz tones down those old #POTS (Plain Old Telephone System) lines.
Way before my time, actually, but it inspired @2600 Magazine, which was a great font of knowledge on lots of more recent geeky things.
https://store.2600.com/products/the-last-hope-2008-the-history-of-phone-phreaking-1960-1980-download