Which regional party won a clear majority in Madras State in 1967 after leading an anti-Hindi agitation?

1. The DMK led students against imposition of Hindi. 2. It won Madras State outright in 1967. 3. It was the first non-Congress party to win a State alone. _Source: syllabus Political Science, Politics in India since Independence, Chapter 5, Challenges to and Restoration of the Congress System._