"Authorities must drop all charges against her, and release her immediately and unconditionally," Sushilkumar Valath, programmes director of the human rights organisation said in a statement here.
"Irom Sharmila is a prisoner of conscience who is being held solely for her peaceful expression of her beliefs," he said.
Referring to her indefinite hunger-strike since November 2, 2000, demanding lifting of AFSPA 1958 after the killing of nine persons during an alleged encounter between para-military forces and insurgents near Imphal airport that year, Valath alleged it was a reminder of India's 'intolerance to dissent'.
But,Sharmila has never been convicted for attempting to commit suicide, Valath said.