"Contributing to a hostile work environment."
I had those cartoons up, plus one other one in my cube. They were up for over a year.
Basically, new coworker was "scared that I'd shoot the place up" and I was gone.
Of course nobody felt "safe" talking to me about it, so they made up some gump about layoffs. I found out about a year afterwards, just how stupid people can be.
Apparently, having another nations flag hanging in your cube was fine, but cartoons expressing a constitutional right was right out. Oh well, I know better to just keep my mouth shut. Even if your current set of coworkers are OK, all it takes is someone new that's "offended" or "scared".