Madhavrao Sadashivrao Golwalkar (19 February 1906 – 5 June 1973) was the second chief of the Rashtriya Swayamsevak Sangh and a thinker. His followers often know him more by the name of ‘Guruji’. He is one of the prominent names for those who propagated the ideology of Hindutva . He is one of the first few leaders of the Sangh.