The FSLN came to dominate the junta, Robelo and Chamorro resigned, and in 1981 Ortega became the coordinator of the Junta. As the only member of the FSLN National Directorate in the Junta, he was the effective leader of the country. After attaining power, the FSLN embarked upon an ambitious programme of social reform. They arranged to redistribute of land to about 100,000 families; launched a literacy drive, and made health care improvements that ended polio through mass vaccinations, and reduced the frequency of other treatable diseases. The Sandinista nationalization efforts affected mostly banks and industries owned by the extended Somoza family. More than half of all farms, businesses, and industries remained in private hands. The revolutionary government wanted to preserve a mixed economy and support private sector investment. The Superior Council of Private Enterprise (COSEP) opposed the Sandinistas’ economic reform. The main organization of Nicaraguan big business was composed of prosperous families from the Pacific coast cities, who dominated commerce and banking. Ortega took a very hard line against opposition to his policies: On February 21, 1981, the Sandinista army killed 7 Miskito Indians and wounded 17.