Kautilya wrote in the Arthashastra that a state could be at risk from four different kinds of threats – internal, external, externally-aided internal and internally-aided external. The internal security scenario in India has a mix of all the shades of threats visualized by Kautilya. It is indeed a dismal scenario.
Links:
[1] https://www.vifindia.org/occasionalpaper/2013/june/19/india-internal-security-challenges-and-responses
[2] http://www.vifindia.org/sites/default/files/India Internal Security Challenges and Responses.pdf
[3] https://www.vifindia.org/sites/default/files/India Internal Security Challenges and Responses.pdf
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[7] https://www.vifindia.org/author/shri-prakash-singh