The Movement for Socialism-Political Instrument for the Sovereignty of the Peoples (Spanish: Movimiento al Socialismo-Instrumento Político por la Soberanía de los Pueblos abbreviated MAS-IPSP or simply MAS) alternately referred to as Movement Toward Socialism or Movement to Socialism (Spanish: Movimiento al Socialismo About this sound listen ) is a Bolivian political movement led by Evo Morales founded in 1998.