KORAPUT: Four naxalites of Tamil Nadu are on an indefinite hunger strike since Sunday in the district jail here, demanding for early disposal of their cases and shifting them to Periyakulam in Tamil Nadu. Muthu Selvam, M. Karthik, Palanivel and Velmurugan were lodged in the jail along with Sundar Murty, an hardcore naxalite from Tamil Nadu on January 15, 2008, for their alleged involvement in attack on police headquarters at Koraput in 2004.