Sikhism prohibits idolatry, in accordance with mainstream Khalsa norms and the teachings of the Sikh Gurus, a position that has been accepted as orthodox. Growing Sikh popular discontent with Gurdwara administration and practices during the 1800s, revivalist movements in the mid-1800s who opposed idol worship like the Nirankaris and the Namdharis (who however have followed a living guru since its inception), and the encroachment of Brahmanical customs in the Golden Temple during that period, led to the establishment of the Singh Sabha Movement in 1873, in which the Tat Khalsa faction, dominant since the early 1880s, pushed to renew and standardize the practice of Sikhism. After a period of political advancement, the Khalsa faction re-established direct control over Gurdwara management over