New Delhi, Sept. 29 -- Prime Minister Narendra Modi will release a commemorative coin and a stamp to mark the centenary of the Rashtriya Swayamsewak Sangh on October 1, said people aware of the details on Sunday. The RSS, which is the ideological fount of the ruling Bharatiya Janata Party, will turn 100 on October 2, on Vijayadashami. The PM, who was a full time volunteer of the RSS, recently spoke about the role played by the Sangh in nation building. On Sunday, in his monthly radio broadcast, Mann Ki Baat, he made a reference to the RSS, and said it was founded by KB Hedgewar in 1925 to free India from "political and intellectual slavery. " According to people aware of the details, the idea for the special commemorative stamp came from th...