What is the fine-grained topic of the following text: Petitioners: Patriotic Union State: Colombia Petitioners representing the labor group Patriotic Union (Unión Patriótica) came before the Inter-American Commission on Human Rights (IACHR), accusing the government of Colombia of systematic political persecution and violence directed towards their organization. Only return the topic.
Accusation of political persecution and violence against Patriotic Union in Colombia by the Inter-American Commission on Human Rights (IACHR)