 Complete the following phrase:  Given Jabirs purported ties with both the Shiite Imam Jaʿfar al-Ṣādiq and the Barmakid family who served the Abbasids as viziers, or with the Abbasid caliphs themselves, it has sometimes been thought plausible that Ḥayyān al-ʿAṭṭār Hayyan the Druggist, a proto-Shiite activist who was fighting for the 