A speech can be held to be an offence, when it is capable of inciting imminent lawless act, the top court had observed.
The court directed the NHRC to report the steps taken to find a logical conclusion to the issue based on the report of its investigation division.
In a statement on Thursday, Advocate Vanchinathan alleged that the industry destroyed human lives and the environment.
Snowlin, who was killed in police firing on May 22, was just a teenager but had already become one of the prominent leaders of the anti-Sterlite protests from Madha Kovil.
1,400 people, including 66 women took part in the road blockade at Anna Salai, Saidapet, Guindy, Thiruvotriyur and Ambattur.
With all four said to have been shot at in the head or chest, there is suspicion whether they were specifically targeted.
The Tuesday’s police firing on the anti-Sterlite protesters in Thoothukudi is perhaps the bloodiest in Tamil Nadu’s history since Independence.
Actor-turned-politician Kamal Haasan said injustice had been done to the people of Tuticorin by establishing the Sterlite unit.
Makkal Needhi Maiyam founder Kamal Haasan lashed out at the State government for not ensuring that the Cauvery Management Board was not constituted.