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By: Ayatullah al-Uzma Sayyid Ali Khamene\'i The era of the Eighth Imam is once again a period of the prevalence of a congenial condition for the spread of Shiism. The Imam enjoys ample facilities and this era leads to the appointment of the Imam as the vicegerent, or in other words, as the heir apparent to the Caliph. However, the Imam observed precautionary dissimulation during the time of Harun, that is, he conducted his efforts and made his endeavors, but camouflaged them. For instance