Returns true if the user is an administrator of the group. 

This method can be accessed through the CommunityGroup.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/CommunityGroup.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "IsCommunityGroupAdmin", Description = "Returns true if the user is an admin of the group.")]
public bool IsCommunityGroupAdmin(long userId, long groupId);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "IsCommunityGroupAdmin", Description = "Returns true if the user is an admin of the group.")>
Public Function IsCommunityGroupAdmin(userId As long, groupId As long) As bool