Who is considered the chief architect of the document that Hindu groups lobbied to add a cow slaughter ban to in 1966?
1966 anti-cow slaughter agitation: In 1966, Hindu organisations agitated to demand a ban on the slaughter of cows in India, as enshrined in the Directive Principles of State Policy in the Constitution of India. Constitution of India:  B. R. Ambedkar, the chairman of the Drafting Committee, is widely considered to be its chief architect.
B. R. Ambedkar