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Jul 3, 2015 10:50 AM in response to placierby léonie,There is no mass delete of unknown Faces.
You can file a feature request using the feedback form, see this link: Apple - iPhoto Mac - Feedback
Only, iPhoto is no longer developed and Apple is not selling it any longer, so there is not much hope, that Apple will do anything about it. All development is targeted towards the new Photos.app.