Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: What is the aim of the BOPE? Movie plot title: Elite Squad: The Enemy Within Movie plot: This article's plot summary may be too long or excessively detailed. Please help improve it by removing unnecessary details and making it more concise. (March 2015) (Learn how and when to remove this template message) The film starts in medias res, 13 years after Baiano's death in the first film's plot. Roberto Nascimento (Wagner Moura) is shown leaving a hospital. Soon after, his car is blocked and gunned down by unknown gunmen. 4 years prior, Nascimento, now divorced and a Lieutenant Colonel in BOPE, arrives at Bangu Penitentiary Complex to put down a prison riot started by gang boss Beirada (Seu Jorge), who demands that human rights activist Diogo Fraga (Irandhir Santos) come in to negotiate. After Fraga convinces Beirada to release hostages taken during the riot, Nascimento's protege Captain Andre Matias (Andre Ramiro) storms in and executes Beirada against Nascimento's orders. Fraga, who is also husband of Nascimento's ex-wife Rosana (Maria Ribeiro), subsequently expresses his outrage over the situation to the media. When Nascimento hears that PMERJ commander Formoso (Rodrigo Candelot) will fire him over the controversy, he goes to personally confront him at a restaurant, only to be greeted by cheering diners who approved the execution. Guaracy (Adriano Garib), Rio de Janeiro's State Secretary for Public Safety, exploits the situation by promoting Nascimento to the office of State Subsecretary of Intelligence and expelling Matias from BOPE and demoting him to the state police. Nascimento tries to convince Matias that he can settle the situation, but Matias rebukes him and goes to tabloid journalist Clara Vidal (Taina Muller) to give her an interview about disregard of BOPE and the corruption of the governor, leading to his detention. Meanwhile, Fraga leverages his influence to become a state representative in Rio's State Assembly and convinces Nascimento's son Rafael that his father is a bad influence on him. Nevertheless, Nascimento continues to focus on his work. He has BOPE and its arsenal...
focus on the relationship between law enforcement and politics