In 1966, Hindu organizations agitated to demand a ban on the slaughter of cows in India, as enshrined in the Constitution of India. Among others, the Shankaracharya fasted for the cause. The agitation culminated in a massive demonstration outside Sansad Bhavan in New Delhi on 7 November 1966. As per Hindu Panchang that day was Kartik Shukla Ashtami of Vikram Samvat, famously known as Gopashtami among Hindus.
The Prime Minister, Indira Gandhi did not accept the demand for a ban on cow slaughtering. A mass of 10,000 advocates against cow slaughter, led by Hindu holymen and thousands of anti-slaughter Hindu devotees tried to storm the parliament, but were prevented. The mob then entered the parliament campus and the capital city saw a furious agitation of Hindus for banning cow slaughter in India. It was revealed that a small number of Muslims were also participated in that Samsad Bhawan gerao rally. A 48-hour curfew was ordered, all the meetings were banned.The Mob also attacked the then congress president Kamaraj’s Delhi residence and set it on fire. Many died in police firing to control the crowd.
The then PM Indira Gandhi washed off her hands by accusing Home minister, Gulzarilal Nanda, who resigned immediately taking responsibility for the administration’s failure to maintain law and order. The Shankracharya Niranjandev Tirth, Swami Hariharananda Ji, widely known as Karpatriji Maharaj and Mahatma Ramchandra Veer went to observing fast unto die for the brutal killing of sadhus and Gau-bhakt devotees in Delhi. Mahatma Ramchandra Veer observed 166 days longtime fast at that time. The next Home Minister (from 14 November 1966 to 27 June 1970) and a puppet of Indira, Yashwantrao Balwantrao Chavan went to the fasting saints and promised to bring the ‘anti-slaughter bill’ in the next session of parliament and the sainsts ended their fasting. But, the anti Hindu Congress Govt never kept their promise.
The agitation Rally of 7th Nov 1966 was started from the Arya Samaj Temple at Chandni Chowk under the leadership of Swami Karpartri Ji Majaraj under the banner of “Gauraksha Mahaabhiyan Samiti”. An unified mass comprising the Sanatani, Arya Samaji, Hindu, Bauhhist, Jain, Sikh, Nath, Nirankari all started march towards Parliament of India (Samsad Bhawan) keeping prominent and most revered saints like Shankaracharyas of Jagannath Puri Govardhan Math and Dwaraka Jotishpeeth, the seven Peethadishes of Vallabh Sampradaya, Ramanuja Sampradaya Peethadhipati, Ramananda Sampradaya Peethadhipati, Mahant of Gorakhpeeth, Saints President and Secretary of Arya Samaj and Granthis of various Sikh shrines.
It is reported that approx 10 lakh people including 20 thousand women participated in that rally on 7th Nov 1966 in Delhi.
Postscript: I have heard from a nonagenarian saint who participated in 1966 Save Cow Movement in Delhi, now living in Haridwar that Srimad Hariharananda Swami, widely known as Karapatriji Maharaj cursed Indira Gandhi for getting a same fate for a massive Hindu killing by brutal firing.
Indira was killed by brutal firing by her bodyguards in 1984 and Rajiv Gandhi was killed by LTTE suicide squad in 1991.
I think the curse of Karpatri Ji maharaj is still in force.