 Among the founders of the MRS are Sergio Ramírez Mercadowhoich (who was the first president), Dora María Téllez, Luis Carrión Cruz, Luis Felipe Pérez Caldera, Leonor Arguello and Reynaldo Antonio Téfel.In 2016, the MRS joined the Progressive Alliance made of formed by more than 130 Labour, Social Democrat and left parties, organisations and movements from around the world.The constitutive convention of the Movimiento Renovador Sandinista/ Sandinista Renovation Movement (MRS) was held on May 21, 1995, on the occasion of Augusto C. Sandino birth's centenary (May 18, 1895).