"This is a very encouraging development and we welcome the Supreme Court's verdict which gives hope to the human rights movement in Chhattisgarh," said Shashikumar Velath, Programme Director at Amnesty International India.
Velath demanded that Chhattisgarh authorities should drop all the charges against the duo.
"The Chhattisgarh authorities should take a cue from this verdict and immediately correct the historic wrongs committed against these two by dropping all other charges.
The 36-year-old Sori and her activist-nephew Kodopi (25) were arrested on charges of acting as Maoist conduits who had allegedly received protection money for the rebels from Essar Group in Chhattisgarh.
In September 2013, Amnesty International India had submitted a petition supported by over 10,000 people to Chief Minister Raman Singh seeking the immediate and unconditional release of Sori and Kodopi.