Ok these guys convinced me to play them again, and what happens? Total obvious collusion:

http://www.conquerclub.com/game.php?game=5844985

2009-10-30 21:01:29 - Round_Earth received 3 troops for 1 regions
2009-10-30 21:01:34 - Round_Earth cashed in a group of Wan Chi, Tai Mo Shan, and Cheung Kang ...

Accused:

Round_Earth
NotFranklin

The accused are suspected of:

Conducting Secret Diplomacy

Game number(s):

5815426

Comments:

These guys obviously ganged up on me with secret diplomacy, I was winning the game, then they probably decided to not attack each other and only attack me. The ...