Allow a non-admin identity/user to "Unclaim" items locked or claimed by others

I have some power users I'd like to give the ability to unlock/unclaim items that other users have locked/claimed. I don't want to give them full admin rights and can't find the method, action, permission, etc... to allow the "Unclaim" action.

This screenshot is an example of the action I'm trying to permit for some select power users. 

Is there a way to enable identities access to this "Unclaim" action? If there is a way to set this based on item type that would be even better.

Currently running Aras 12 sp4.

Thank you in advance!