Which state did you study? Were you educated in CBSE school? Becausw you do not know history of Tamil Nadu.
Agittation iun TN was AGAINST Hindi imposition. These agitations were called "ANTI-HINDI Agitation",
This is what forme4 CM Annadurai said:
Speaking at a Public Meeting on April 29, 1963 at Chennai Marina (Madras Marina) organized to oppose Hindi becoming the official language of India from January 26, 1965, Annadurai said,
"We will go to every part of Tamil Nadu and tell the people that Hindi is coming and that it is like a thunder strike on the heads of Tamil and Dravidian people
You want to know full details of anti-hindi agitations bwrween 1938 and 1968
History: A Chronology of Anti-Hindi Agitations in Tamil Nadu and What the Future Holds
http://www.tamiltribune.com/03/0101-anti-hindi-agitation-history.html