Within a decade of its inception, the SNDP attained incredible success, and then onwards, it had been steadily growing adapting itself to suit the changing socio-political conditions and consequent needs of the people.
Under the leadership of Mahakavi Kumaran Asan, and Dr. Palpu, the Yogam raised its voice of protest against the denial of civic and human rights to Avarnas. The Yogam was in the vanguard of the fight for the rights of the depressed classes, especially the non- caste Hindus. But the voice of protest was mainly through representations to rulers and Government, newspaper writings and pamphlets, etc.
The SNDP first fought for the admission of Avarna children to Govt. schools and won. With this success, the number of educationally qualified youth in the community increased. The Christian missionary institutions also contributed to this increase. But employment in Government was still out of reach for them. The Christians could get into Govt. service through the influence of the British, but the Ezhavas were kept out. After repeated representations, a great favor was granted that the Ezhavas could be employed in the lower ranks in departments other than Revenue. (The Revenue Department could not take the Ezhavas because it was dealing with Temple Administration and the Ezhavas being Avarnas were not supposed to touch those papers!) When the Avarnas applied for Government jobs, they were either asked by the Savarna officials to take up their traditional profession, or their applications were summarily rejected saying that there were no vacancies. The SNDP took up the issue. Protests against the princely rulers and caste Hindu officials gradually became an integral part of India's national movement, and the SNDP developed a high political stock.
The SNDP entered its second phase when T. K. Madhavan took over as its organizing secretary. He was a firebrand and a committed nationalist. Madhavan brought in a tremendous increase in the membership of the SNDP within a short period. He also took up issues which caused the Yogam to adopt methods of agitation
The first important issue was to fight for the Avarnas' right to use public roads around the temples which resulted in the famous Vaikkom Satyagraha, and later led to the Temple Entry Proclamation by the Maharaja of Travancore. It is to be noticed that Travancore was the first princely state in India to take this progressive step. "Removal of untouchability is an abstract idea. Temple entry is a concrete representative action of the abstract idea." - Mahatma Gandhi.

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