ভূমিকা
Shiavault - a Vault of Shia Islamic Books Muawiya Maula 'ali (as) Was Cursed For Ninety Years Allamah Shibli Numani writes: "Traditions were first formed in book form in the days of Ummayads, who, for about 90 years, throughout their vast dominions stretching from the Indus in India to Asia Minor and Spain, insulted the descendants of Fatima and got Ali openly censured in Friday sermons at the mosques.
They had hundreds of saying coined to eulogise Amir Muawiya." (taken from Siratun Nabi, Volume 1 page 60). Siratun Nabi Vol.1 page 60 Summary of references So to summarise from the references presented (many more could have been cited we felt this will suffice for the sake of brevity), we learn: Mu'awiya used to curse Hadhrath 'Ali (as) He introduced the bidah of cursing 'Ali (as) in the mosques following the Friday Sermons during his reign.
In line with the order his Governors would carry out the bidah of cursing 'Ali in the Mosques This outrageous bidah went on for 90 years During that same time (of cursing) hadith were first collected Umar bin Abdul Aziz abolished this ugly bidah.
Conclusions In light of these established let us now see the true position of Mu'awiya in light of hadith and Fatwas of Ahl'ul Sunnah: Rasulullah (s) cursed those who commit bidah Abdul Qadir Jilani in "al Ghuniya" Voulme 1 page 60 narrates that Rasulullah (s) said: "Whoever introduces a bidah or protects it is cursed by Allah (swt) his Angels and the vast bulk of mankind".
Allamah Abdul Qadir Gilani's Fatwa against Ahl'ul bidah Abdul Qadir Jilani in "al Ghuniya" Voulme 1 page 18, Chapter "Dhikr Mu'awiya" states: No one should go near Ahl'ul Bidah, don't go near them, don't share in their happiness on Eid, don't participate in their Salat or Funerals, don't read mercies upon them".
Allamah Saduddeen Taftazanee' s fatwa that Ahl'ul bidah should be cursed Allamah Saduddeen Taftazanee in Sharh al Maqasid page 270 comments: "One should hate Ahl'ul bidah, talk ill of them, curse them, do not pray Salat behind them to do so is Makruh". These fatwas make it clear those that indulge in bidah are cursed and it is a duty to separate ourselves from such people.
This being the case one needs no reminding that Mu'awiya was responsible for the introduction of the bidah of cursing Ameerul Momineen 'Ali throughout his empire a bidah that went on for 90 years.