Yeah, we can tell you have no legal background, whatsoever.well, you get what i mean. i've seen it used so much to justify new restrictions. that is the exact reason why no restrictions should be in place, other than direct "i'm going to kill X" or "i want you all to go kill Y" threats. even those are iffy, since it could be used the same way.
as for who, do you really want me to make a gigantic list of names? that'd be very annoying to type. i can think of specific cases, but i can't remember the names behind them. there was one that was a hit to free expression in the banning of "loli" sex dolls, there's been a few banning sexual games, attempts at laws to criminalize hate speech against whatever minority you can imagine, banning violent games. for guns, there's this thread we're in right now, the shit going on in virginia, outright trying to take many types of guns. heavy restrictions in california, new york, and others.