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In page Nagalingam Shanmugathasan:

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In 1971 Shanmugathasan was imprisoned for one year during a crackdown on revolutionaries following the Janatha Vimukthi Peramuna (People's Liberation Front)[5] rebellion. Shanmugathasan was targeted by the government for his espousal of armed revolution for political change and for being identified as one of the political mentors of Rohana Wijeweera, the founding leader of the JVP. While detained in prison Shanmugathasan authored a book, A Marxist Looks at the History of Ceylon.