Keshav Baliram Hedgewar (1889-1940) was the founder of the RSS and its first sarsangchalak (supreme leader). He founded the RSS following a visit to V. D. Savarkar, and gave it its modern organisational form with shakhas (local branches), each managed by a pracharak ("preacher") dedicated to the organisation, and populated by swayamsevaks ("volunteers") to spread the message of Hindutva.
References
• Hindu Nationalism: A Reader Edited by Christophe Jaffrelot, Princeton, 2007.