The faction is i

Open, last I heard.

Sieges require gear and numbers. Gear is manageable, but numbers cannot be automagically generated.

If you want to be on BDO KGB, the best approach in my opinion is to consider BDO as a multiplayer version of Skyrim. If you want to take part in sieges, there are other organizations you can seek out.

To the everlasting glory of the infantry...

Owain ab Arawn
KGB Supreme Knight
King's High Council