Q 4:
Is it permissible to perform Salah (Prayer) behind an Imam who is a Fasiq (someone openly and flagrantly violating Islamic law) according to witnesses of this?
Please note that this Imam is appointed by the Department of Mosques, thus the residents of this neighborhood are forced to offer Salah behind him.
A:
This concern should be reported to the department concerned. When it checks and finds reasons that prevent his Imamate, it has to dismiss him and appoint a competent one instead. As to offering Salah behind him, it is valid, for
Ibn `Umar offered Salah behind
Al-Hajjaj who was one of the most heinous wicked people.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.