American scholar George L. Hart, based on his interpretation of Old Tamil texts such as "Purananuru", traced the origin of untouchability to ancient Tamil society. According to him, in this society, certain occupational groups were thought to be involved in controlling the malevolent supernatural forces; as an example, Hart mentions the Paraiyars, who played the drums during battles and solemn events such as births and deaths. People from these occupational groups came to be avoided by others, who believed that they were "dangerous and had the power to pollute the others". Jaiswal dismisses the evidence produced by Hart as "extremely weak" and contradictory. Jaiswal points out that the authors of the ancient Tamil texts included several Brahmanas (a fact accepted by Hart); thus, the society described in these texts was already under Brahmanical influence, and could have borrowed the concept of untouchability from them.