Siny Soy, 54, involved in several crimes including abduction of a police officer and attack on Daitary police station in Keonjhar, was arrested last night.
Self-styled chief commander of Kalinga Nagar division committee of the banned outfit, Soy was operating in Jajpur, Keonjhar, Angul and Dhenkanal districts.
Her prime work was to induce women, especially from rural areas, into the outfit, police said.