Check for group membership in Header code?

[vinothkannans (Vinoth Kannan)]

@Cozdabuch

I want the category contents invisible to the admin(s), but visable to the members of the a specific group:

You should have a second non-admin account for that purpose.

@Cozdabuch

This part doesn’t work:

It should be the primary group of that user. Also make sure the order is correct.