How do I set a condition to only show a block to members of a group?

I use the Drupal Group module. Is there a way to check if a logged-in user is an groupmember or not when the user visits the grouppage? I have some blocks that should be hidden if an user is not a member.


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Author Of this post: Tetragrammaton
Title Of post: How do I set a condition to only show a block to members of a group?
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