Anti-Brahminism or Anti-Manuvaad is an ideology that protests against prejudice and discrimination directed towards Dalits and women by the brahmanical system. It holds Manu Smriti, the book of legal codes which justifies ritual pollution and patriarchy, as the ideological text of Brahminism.
Early criticism against Brahmanism flourished within Sramana movement. Particularly in Nāstika schools of Indian philosophy like Buddhism, Jainism, and others such as Ājīvika, Cārvāka and Ajñana.
Ajñana were the sceptical school of ancient Indian philosophy. A major rival of early Buddhism, Jainism and Vedic Hinduism.
Herein a certain recluse or brahmin does not understand, as it really is, that this is good or this is evil. And it occurs to him: I do not understand what is good or evil as it really is. Not understanding what is good or evil, as it really is, if I were to assert that this is good and this is evil, that will be due to my likes, desires, aversions, or resentments. If it were due to my likes, desires, aversions or resentments, it would be wrong. And if I were wrong, it would cause me worry (vighato) and worry would be a moral danger to me (antarayo). Thus, through fear of being wrong (musavadabhaya) and the abhorrence of being wrong, he does not assert anything to be good or evil and on questions being put to him on this or that matter he resorts to verbal jugglery and eel-wriggling, saying: I do not say so, I do not say thus, I do not say otherwise, I do not say no, I deny the denials. (literally, I do not say "no, no")
The fourth school of Ajñana scepticism is associated with Sanjaya Belatthiputta. Sanjaya is described as a contemporary of Buddha, as a well-known and celebrated teacher, and as a leader of a sect who was held in high esteem by the common folk. He is said to have taught Sariputta and Moggallāna, before their conversion to Buddhism.