1984 sikh riot by congress, killed more than 5000 sikh
continious attack on Ahamdabad Rath yatra In Gujrat.
The main riot which killed or displace or brought people to the road was 1947 partition which was due to this Congress & Nehru (Nehru always wanted to rule India in any cost). History never forget about that Congress & Muslim league pre planned agenda to divide this country for few peoples benefit.
And if you wanted to know olden riot, then learn history where:
Mohd Goury attack 17 times on India to slaughter Hindus and loot gold from this country
Allauddin Kheelji attack 16 times on Chittorgarh (Maharana Pratap Place) to grab gold & Rani Padmini.
Babar, Humaun & Akbar came from Baluchisthan attack on this country and slaughter lot of HIndus.
Hyder Ali & Tipu Sultan (King of Mysore)converted 30 lakh Hindus to Muslim by showing sword.
Aurangjeb imposed Jajia tax, if Hindus are wearing sacred thread & keep pigtail (Choti), and that was the reason at the time of Sirajjudaula (Nawab of Bangal) lot of convertion was happen, infact sometime full village were converted in wholesale rate by imposing tax or showing sword.
If all these example are still not yet able to open your eye, then pity on you, may god bless you with foresight & open your eye.