▁issues ▁that ▁the ▁student ▁movement ▁would ▁tack le ▁were ▁defined : ▁the ▁university ' s ▁aut onomy , ▁and ▁the ▁freedom ▁and ▁dem ocrat ization ▁of ▁education . ▁ ▁Then , ▁in ▁ 1 9 5 7 , ▁the ▁National ▁Union ▁of ▁University ▁Stud ents ▁was ▁established . ▁The ▁university ▁would ▁become ▁an ▁important ▁member ▁of ▁this ▁organization , ▁whose ▁first ▁significant ▁action ▁would ▁take ▁place ▁in ▁May ▁of ▁the ▁same ▁year ▁that ▁ended ▁the ▁dict ator ship ▁of ▁General ▁Gustav o ▁Ro jas ▁Pin illa . ▁The ▁events ▁started ▁with ▁a ▁strike ▁by ▁students ▁of ▁the ▁university , ▁followed ▁by ▁students ▁of ▁private ▁univers ities ▁in ▁Bog ot á , ▁and ▁then ▁by ▁workers ▁in ▁the ▁industrial , ▁transport ation , ▁financial , ▁and ▁commercial ▁se ctors . ▁ ▁The ▁student ▁movement ▁has ▁not ▁been ▁free ▁from ▁the ▁influence ▁of ▁radical ▁groups . ▁This ▁influence ▁intens ified ▁in ▁the ▁ 1 9 6 0 s , ▁during ▁the ▁government ▁of ▁Carlos ▁L ler as ▁Rest repo , ▁who ▁initi ated ▁a ▁repr ess ive ▁and ▁military ▁approach ▁to ▁the ▁university ▁conflicts . ▁ ▁Since ▁then , ▁there ▁have ▁been ▁confront ations ▁between ▁radical ▁groups , ▁from ▁inside ▁and ▁outside ▁of ▁the ▁university , ▁and ▁the ▁police , ▁in ▁the ▁campus ▁grounds ▁and ▁its ▁surr ound ings . ▁On ▁some ▁occasions ▁this ▁resulted ▁in ▁participants ▁being ▁injured ▁or ▁even ▁killed . ▁ ▁On ▁April ▁ 4 , ▁ 2 0 0 1 , ▁during ▁a ▁confront ation ▁between ▁mask ed ▁individuals ▁and ▁the