1848: First "systematic campaign" against the Faith by civil and ecclesiastical powers combined

…when Muhammad Sháh finally succumbed to his illness, precipitating by his death the downfall of his favorite and all-powerful minister, Hájí Mírzá Áqásí, who, soon stripped of the treasures he had amassed, fell into disgrace, was expelled from the capital, and sought refuge in Karbilá. The seventeen year old Násiri’d-Dín Mírzá ascended the throne, leaving the direction of affairs to the obdurate, the iron-hearted Amír-Nizám, Mírzá Taqí Khán, who, without consulting his fellow-ministers, decreed that immediate and condign punishment be inflicted on the hapless Bábís. Governors, magistrates and civil servants, throughout the provinces, instigated by the monstrous campaign of vilification conducted by the clergy, and prompted by their lust for pecuniary rewards, vied in their respective spheres with each other in hounding and heaping indignities on the adherents of an outlawed Faith. For the first time in the Faith’s history a systematic campaign in which the civil and ecclesiastical powers were banded together was being launched against it, a campaign that was to culminate in the horrors experienced by Bahá’u’lláh in the Síyáh-Chál of Ṭihrán and His subsequent banishment to ‘Iráq. Government, clergy and people arose, as one man, to assault and exterminate their common enemy. 

- Shoghi Effendi  (‘God Passes By’)