The correct answer is MN Roy. Explanation & Key Takeaways: • Manabendra Nath Roy (21 March 1887 – 25 January 1954), born Narendra Nath Bhattacharya, was an Indian Communist revolutionary, radical activist, and political theorist, as well as a noted philosopher in the 20th century. • Roy was a founder of the Mexican Communist Party and the Communist Party of India (Tashkent group). • He was also a delegate to congresses of the Communist International and Russia's aide to China. • Following the rise of Joseph Stalin, Roy left the mainline communist movement to pursue independent radical politics. • In 1940 Vinay Roy was instrumental in the formation of the Radical Democratic Party, an organization in which he played a leading role for much of the decade of the 1940s. • In the aftermath of World War II Roy moved away from orthodox Marxism to espouse the philosophy of radical humanism, attempting to chart a third course between liberalism and communism. Related Concepts: • Narendra Nath "Naren" Bhattacharya, later known as M. N. Roy, was born on 22 March 1887 at Arbella, located in the North 24 Parganas of West Bengal, near Calcutta (Kolkata). • Most modern forms of communism are grounded at least nominally in Marxism, a theory and method conceived by Karl Marx during the 19th century.