My friends and I were trying to hold an event in our FC home, we were still in the midst of getting people and rooms prepared when an uninvited person came in and started trolling us.
The leader asked him nicely to leave three times but didn't get a reply, so another member asked him nicely to leave, the player proceeded to be annoying and responded "lol no" and started to say that he has several alternate accounts to harass us (As he was banned before and his parents bought him the game again...)
We didn't want to lock our friends and guests out of our home because of one person ruining the occasion.

So we waited to see if he would leave, but he didn't and started harassing the guests too, so one of the members reported him to the GM for harassment and disruption of others' gameplay experience.

Of course she ended up getting the usual answer:
"We'll look into it and the player is being investigated although they're in your home... RIGHT NOW bothering you and making your event less enjoyable for you and your guests... <insert more typical GM response here>"

TL;DR:
I'd like to propose a blacklist for Free Companies that allow you to block players and any alternate characters they have and the ability to automatically lock them out of the home after being added to the list.