The Lok Sewak Sangh ('Union of Servants of the People', abbreviated LSS), or Manbhum Lok Sewak Sangh, was a political party in Purulia District, West Bengal, India. LSS was founded in 1948. The party was the main political force in Purulia District from the independence of India until the fall of the second United Front cabinet. It is not to be confused with the Gandhian social movement by the same name.