You have to help me find it - I went through the archives in that link and the closest I could find was why the parties asked for a Dravidian state and not a Tamil state - meaning TN, Karnataka, AP and Kerala which was a non-started anyway
Sorry. Gave ypu wrong link.
See the following link. If you are short on time, just search 1963 in that page. It will take you to the para discussing the draconian inti-democratic Indian law that ban parties that seek independence.
TN independence and DMK and Annadurai