K Mothibai (40) alias Madhavi or Radhakka, south and West Bastar division committee secretary of CPI (Maoist), and Pridhvi and his father Dharmaraju were taken into custody yesterday after a chase near Palvancha in Khammam.
Dharmaraju, who was found to have no Maoist links, has been put under a bond for appearance in future by the police.
Mothibai is the wife of Chandranna, secretary of North Telangana zonal committee of the Maoists. She carried a reward of Rs five lakh on her head.
She was allegedly involved in several incidents of murders, arson among others.
Prudhvi, a student of Hyderabad Central University, allegedly worked in a 'dalam' in Khammam district and neighbouring Chhattisgarh, they said.