During the 1920s in South India, the non-brahmins organised the Self-Respect Movement led by E.V. Ramaswamy Naicker.  

• There were numerous other movements demanding that the ban on the entry of lower castes into temples be lifted.  
• Sri Narayana Guru in Kerala led a lifelong struggle against upper caste domination.  
• He coined the slogan “one religion, one caste, one God for mankind”, which his disciple Sahadaran Ayyapan changed into “no religion, no caste, no God for mankind”. 

Source: Spectrum Modern India.