 At this time , the first serious student revolts started to emerge , motivated by the local and global changes of the decade , like the Vietnam war , the European student movement , the presence of the Peace Corps in Latin @-@ America and specially in Colombia , the rejection of the IDB loan and the presence of the foreign foundations . On February 15 , 1971 , after the unconsulted election of the Dean of the Division of Social Science and Economics , some students took the rectory . This marked the first incursion of the police force to the university campus . For these events , some professors and students were expelled of the university . Nevertheless , the support for the rector dropped , who had to resign . Since mid February to April , the university was closed until the new rector was appointed . 
