The Túpac Amaru Revolutionary Movement (MRTA) page is informed largely by sources critical of the movement, and consequently they are cast in an overtly negative light. The article is largely accounts of their criminal and terrorist activity, with very little from the perspective of members and collaborators. The MRTA was of course unambiguously violent and guilty of violating international humanitarian law. To improve the article, I would likely look at sources that discussed the trials related to MRTA members, as well as any manifestos or statements issues by the group on their stated goals. The talk page also has multiple instances of editors drawing doubt on the accuracy of information released by the Peruvian government.