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The Lanka Sama Samaja Party (LSSP), founded in 1935, led the United Front coalition in the 1960s in Sri Lanka. The LSSP, a leftist party, advocated for social and economic reforms, including land redistribution and the nationalization of industries. The United Front, comprising the LSSP and other left-wing parties, won the 1960 general election, marking a significant political shift in the country's history.