Papa Rao, a senior Naxal leader who was active for nearly 30 years in Chhattisgarh, has surrendered along with 17 other cadres in Bijapur district, the Chhattisgarh police said on Tuesday. Papa Rao, who carried a reward of ₹25 lakh, was a member of the Dandakaranya Special Zonal Committee (DKSZC) and was in charge of the South Sub Zonal Bureau.