All India Bar Council was established under which Act?

The Advocates Act, 1961

After the enactment of the Advocates Act ,1961 all the old categories of practitioners (vakils, barristers, pleaders of several grades, and mukhtars) were abolished and consolidated into a single category called "advocates" who enjoy the right to practice in courts throughout India. The Advocates Act also established an All India Bar Council for the first time, with the Attorney-General and Solicitor General of India as ex- officio members of the Bar Council.