No actual laws were broken. The media is trying to make it sound like Redditors are somehow conducting insider trading, but that is because the media doesn't understand how stock trading actually works. Redditors simply realized that AMC and Gamestop were being shorted and they banded together to conduct activist trading. This has been done before, but never to this degree. I find it very amusing to watch!
Jay Gould and his cohorts were stock manipulators, and were very good at it.
https://en.wikipedia.org/wiki/Erie_War