Traffic Police (CCTP) is responsible for the traffic management in the city. The metropolitan suburbs are policed by the Chennai Metropolitan Police, headed by the Chennai Police Commissionerate, and the outer district areas of the CMDA are policed by the Kanchipuram and Thiruvallur police departments. (prior to the expansion of Chennai Corporation area), Chennai city has a sanctioned strength of 14,000 police personnel. With a population density of 26,903 persons per square kilometre, the city had 1 policeman for every 413 people. The Chennai suburban police had about 4,093 police personnel and a ratio of 1:1,222. In 2010, the crime rate in the city was 169.2 per 100,000 people, as against an average of 341.9 in the 35 major cities of India. In 2011, North Chennai zone had 30 police stations and 3 police out posts, Central Chennai zone had 28 police stations and 3 police out posts, and South Chennai zone had 30 police stations. In 2009, Madras Central Prison, one of the oldest prisons in India, built over of land, was demolished; the prisoners were moved to Puzhal Central Prison. Politics Since the 19th century, when Western scholars proposed that Dravidian languages, which dominated the southern region of India, formed a different linguistic group to that of the Indo-Aryan languages that are predominant in the north of the subcontinent, the aspects of Tamil nationalism gained prominence. This resulted in the Anti-Hindi agitations in the city and across the state. However, the post-Independence re-organisation of Indian states according to linguistic and ethnic basis has moderated Tamil nationalism, especially the demand for separation from the Indian Union. The Anti-Hindi agitations in mid-1960s made the DMK more popular and more powerful political force in the state. The agitations of the 1960s played a crucial role in the defeat of the Tamil Nadu Congress party in the 1967 elections and the continuing dominance of Dravidian parties in Tamil Nadu politics. Being the capital of the Madras Province that covered a vast area of the Deccan region, Chennai remained the centre of politics in the southern region of India during the British colonial era. After Independence, it remained the centre of political activities of the state of Tamil Nadu. Chennai is the birthplace of the idea of the Indian National Congress, commonly known as the Congress Party. Founded by Indian and British members of the Theosophical Society movement, most notably A.O. Hume, the