MIR. In 1969, following the "Osses case", a direct (non-fatal) operation acted by four militants of MIR in Concepción against the right-wing tabloid Noticias de la Tarde, the Christian Democratic Party government used the incident to ban the MIR and begin persecution of its known leaders. The government publicized a national list of 13 young MIR leaders for their capture. Among them, all between 22 and 26 and with links to the University of Concepción, were Doctors Miguel Enríquez and Bautista van Schouwen, Professor Marcello Ferrada de Noli, medical student Luciano Cruz, sociologist Nelson Gutiérrez, lawyer Juan Saavedra Gorriategy, civil engineer Aníbal Matamala, and economist José Goñi (Goñi later became a Minister of Defense and ambassador of Chile in the USA). Some of them were captured after spectacular operatives coordinated by the central headquarters of the Chilean Political Police in Santiago, tortured, and imprisoned in the Cárcel of Concepción and in Santiago. On 1 May 1969, fifteen armed MIR guerrillas stormed the Bío-Bío radio station of Concepción and transmitted a discourse urging the people to take up arms and overthrow the current government. On 21 May, a group of local MIR sympathizers took to the streets of Concepción and attacked the branches of 'The City Bank' in the city and the offices of the La Patria newspaper. The banning of MIR by the Christian Democratic government in 1969 drastically changed the organization of MIR, which entered a clandestine political existence with semi-autonomous operative-structures that survived even during the first years of the military resistance of MIR against the 1973 Chilean coup. The threat from the MIR was underlined by the discovery at the end of May of a guerrilla training camp in the southern province of Valdivia. Beginning in March 1968, a series of MIR bomb attacks took place in various parts of the country that targeted, among others, the U.S. consulate, the Chilean-American Institute in Rancagua, the main office of the Christian Democratic Party, the office of Chile's largest-selling El Mercurio newspaper and the residence of senator Francisco Bulnes of the National Party. In June 1971, a small group known as the Vanguardia Organizada del Pueblo (VOP), founded among others by two former MIR militants expelled from the Organization in 1969, conducted the abduction and murder of the former Minister of Interior Affairs during the Christian Democratic government, Edmundo Pérez Zujovic. The Minister had been singled out by sectors