Determining group membership

RT 2.0.15

I am trying to create a custom link in the ‘Tabs’ section that only
members of a certain group should see. Creating the link is easy,
restricting who sees it seems to be beyond my abilities. I am looking at, and I assume I should be using the ‘HasMember’ method, but I
can’t seem to figure out the correct syntax. I thought it would be
something along the lines of:

if ($self->CurrentUser->GroupId => ‘Allowed Group’) {
print ‘link’

I’m not very comfortable with Mason, so please be gentle…

Thanks in advance for any help.

Tom Lichti