Sarkar founded the organization "Proutist Block of India" to further the ideals of his theory through political and social action. Tantra in Ananda Marga Sarkar weaves continuity with the ancient philosophy of Tantra, infusing new insights in human psychology, social theory and in each individuals' roles as spiritual and "socio-economic-cultural-political" beings. Ananda Marga Tantra is claimed to have a broad metaphysical base which allows for ways of knowing, feeling and processing which go beyond intellectuality or limited rationality. Priorities are given to the spiritual development, as Sarkar notes, "spiritual life controls all other arenas of human life." Ananda Marga Tantra is claimed to be a principle which if practiced will lead to the desired objective. The essence of Tantra is to awaken the latent spiritual force in the human personality and unify oneself with the Cosmic Consciousness. Guru and disciple According to tantric tradition a proper preceptor and a proper disciple are both essential for success on the path of Tantra. P.R. Sarkar clearly explains that, disciples are of three categories: 1) disciples that acquire spiritual knowledge when they are in close contact with the preceptor, but as soon as they are apart from him they forget all his/her teachings, 2) disciples that learn many things from the preceptor with great hardship, but do not take proper care to preserve those instructions. They lose their hard-earned knowledge out of negligence, 3) disciples that carefully preserve deep in their minds and hearts whatever they have learned from their preceptor by wisely putting those teachings into practice. This is the best category of disciples. Controversies Sarkar's incarceration During the 1960s, the organisation expanded rapidly in India, sending Acharyas as missionaries to other continents. Ananda Marga's popularity in India put it in direct confrontation with the Communist Party in West Bengal. In 1967, Ananda Marga headquarters came under attack by locals who were allegedly incited by Communist leaders. Criticism of corruption in the Indian government by acharyas of Ananda Marga also put it in confrontation with Prime Minister Indira Gandhi. In 1971, Sarkar was imprisoned in India for the alleged murder of five former Ananda Marga members, on what were later proved false charges. The Ananda Marga organisation was banned and a number its leaders arrested. In February 1973, Sarkar was poisoned in prison, allegedly by the jail doctor on orders from the higher echelons of government. On 1 April, after recovering his