During Mu'awiya's reign when the custom of cursing Ali from...
During Mu'awiya's reign when the custom of cursing Ali from the pulpit's of Mosques began, hearts of the Muslims were being bled dry but people bit their tongues fearing death. In Kufa Hujr bin Adi could not remain silent and he began to praise Ali (ra) and condemn Mu'awiya. Until Mughira remained the Governor of Kufa, he adopted a lenient attitude towards this, but when Ziyad's Governorship of Basra was extended to include Kufa, serious altercations arose.
He would curse Ali (ra) during the khutba and Hujr would refute him. On one occasion he (Hujr) warned Ziyad for being late for Jumma prayers. Ziyad then arrested him along with twelve of his companions on false accusations of forming an opposition group to overthrow the Khalifa and was cursing the Khalifa.
He also gathered witnesses to testify against them alleging that they claimed that khilafath was the exclusive right of the lineage of Ali ibne Abi Talib and further accused them of creating an uproar, throwing out the commander and of supporting Abu Turab Ali, of sending blessings upon him and hating his enemies. From amongst these witnesses, Qadi Shudhri's testimony was used.
He later wrote to Mu'awiya that the blood and property of people who said they offered Salat, paid zakat, and performed Hajj and Umrah, preached right and declared that evil was haram, however if you want to kill them so be it, otherwise forgive them. The accused were sent to Mu'awiya and he sentenced them to death. A condition was placed that if they cursed Ali (ra) and showed their hatred to him they would be pardoned.
They refused and Hujr said I will not say that thing that will displease Allah'. Finally he and his seven companions were murdered.
From amongst them Abdur Rahman bin Hassan was sent back to return with a written instruction that he be murdered in the worst possible manner, Ziyad buried him alive (Tarikh al Tabari, Volume 4 page 190 - 208, al Istiab by Ibn Abdul Barr Vol I page 135, Tarikh by Ibn Athir Volume 3 page 234 - 242, al Bidayah al Nihaya by Ibn Kathir, Volume 8 page 50 -55j, Ibn Khaldoon Volume 3 page 13).
Abu Sulaiman then seeks to defend the method of killing: Ansar.org states:"Muawiya's severity in killing Hijr was because Hijr tried to transgress against the Islamic nation and to break the bond of the Muslims and Mu'awiyah considered it as an endeavor to corrupt the earth especially in Kufah where some groups of the affliction first appeared against Uthman.