|Author:Laxman Burdak, IFS (R)|
Karna Parva/Mahabharata Book VIII Chapter 30 mentions the tribes who are not followers of Brahmanism. Viraka (वीरक) is mentioned in Mahabharata (VIII.30.45).....The Karaskaras, the Mahishakas, the Kalingas, the Kikatas, the Atavis, the Karkotakas, the Virakas, and other peoples of no religion, one should always avoid.
Bhim Singh Dahiya writes.... We know that Orissa and the adjoining areas were under the Jats for a pretty long time. The coins of the Tanka clan of the Jats identified by historians as the Puri Kusanas, have been found during excavations. It was In 592 A.D. that the Kesari King, Yayati, superseded the Tank Jat ruler in Orissa.92 The 'Guptas' are called Karaskaras by some people, and this was thought to be a tribal name. In fact, it was the name of a country. Mahabhashya knows a plant (used in medicine) named Karaskar, obviously after the country.93 Vayu Purura says that Karaskara, Kalinga and countries north of Indus river, are inhabited by people devoid of Ashrama Dharma (Hindu division of caste, etc.).94 This is further proof of the fact that 'Guptas' were not originally Indian as the Karaskaras did not follow the caste system. Mahabharata mentions Karaskara, Mahishaka, Karambha, Katakalika, Karkara and Viraka. 95It is again clear, that like the Khatkal, Kakaran, Virk, etc., the Karaskars were Jats.
92. JBORS, 1930, Vol. XVI, p. 460.
93. P.D. Agnihotri, op. cit. p. 277.
94. Vayu Purana, 78/23.
95. MBT, Karna Parva, 37/54.
वीरक (AS, p.866): एक प्राचीन स्थान जिसका उल्लेख महाभारत, कर्णपर्व में हुआ है- 'कारस्करान्माहिष्कान् कुरंडान् केरलांस्तया, ककाटकान् वीरकांश्च दुधर्मांश्च विवर्जयेत।'- महाभारत, कर्णपर्व 44,43. इस उल्लेख में वर्णित जनपदों के निवासियों को महाभारत के समय दूषित समझा जाता था, क्योंकि संभवतः ये लोग अनार्य जातयों से संबंधित थे। प्रसंगानुसार 'वीरक' दक्षिण भारत का कोई जनपद जान पड़ता है। 
- Bhim Singh Dahiya: Jats the Ancient Rulers (A clan study)/The Empire of the Dharan Jats, Misnamed Guptas,p.194
- Sandhya Jain: Adi Deo Arya Devata - A Panoramic View of Tribal-Hindu Cultural Interface, Rupa & Co, 7/16, Ansari Road Daryaganj, New Delhi, 2004, p.142, s.n. 211.
- कारः करान महिषकान कलिङ्गान कीकटाटवीन, कर्कॊटकान वीरकांश च दुर्धर्मांश च विवर्जयेत (VIII.30.45)
- Jats the Ancient Rulers (A clan study)/The Empire of the Dharan Jats, Misnamed Guptas,p.194
- Aitihasik Sthanavali by Vijayendra Kumar Mathur, p.866