MLS Bans Anti-Fascist Signs & Flags, And What Else?

Its getting confusing, folks. Looks like MLS is banning ALL political speech. I'm not sure if that's constitutionally allowed, but that aside hasn't MLS in the stadiums supported anti-racist, women's rights and gay rights movements?

So, are they now also to be banned? Or, is there just selective banning?

http://www.insideworldfootball.com/2019/08/12/mls-rules-anti-nazi-iron-front-flags-stadia/