"It is condemnable that Sri Lankan government is denying basic democratic rights and is constantly involved in such autocratic activities," he said.
Karunanidhi further recalled that the US Embassy in Sri Lanka had asked Colombo to allow free movement of citizens.
"These family members are calling for information about their missing loved ones. The embassy calls upon Sri Lankan authorities to allow free movement of these citizens. The right to freely express opinions is universal and protected under Sri Lankan and international law," the US embassy had said on Wednesday.