There is a hacker entering groups without being accepted by any managers and proceeds to make all of the managers into members and makes himself Manager.
He/She then sends out spam emails as group announcements to all of the other group members. This is to obtain your info so he can move on and hack into another group.
ALL OF YOU MUST check your profile setting and make sure that you DO NOT have your email address showing. If you do remove it by updating your personal profile and Do Not make your email address visible to others !!!
The hacker's msn nick used is
Kaz-Manager.
It's the same person responsible for many groups hacking. So the above warning should apply to all Groups ...