Four hardcore Maoists on Friday surrendered before IG (South-Western) Yeshwant Jethwa in Koraput district.
The ultras who gave up arms are Krishna Praska, Raju Hikaka, Kosai Wateka and Durjan Mandangi.
They were members of the Koraput -Srikakulam Division of the outlawed CPI(Maoist) and were carrying a reward of Rs1 lakh each on their heads, sources said.