Death of Gustavo Soler adds to long list of unpunished crimes: Gustavo Soler, President of the El Paso section of the energy workers' union Sintramienergética, has been murdered in Colombia. His death adds one more name to the long list of Colombians slain for defending workers' rights. Labour activists are among the most frequent targets for assassination in Colombia - mainly by right-wing death squads, and sometimes also by guerrilla movements.