This is the best macro trick in the book. What you're going to have to do is make a macro. I made the macro such as this one here:
/gremove Player1
/gremove Player2
/gremove Player3 ect...
This is great for disbanding guilds if you're only officer.
This one is what I like to use for wintergrasp if you get leader:
/kick Player 1
/kick Player 2
/kick Player 3 ect...
They both work great! Please enjoy.