The document provides a history of MS-13 and details about the gang. It originated in the 1980s as Salvadoran immigrants fled to the US due to civil war. Deportations in the 1990s spread the gang to other Central American countries. The gang is now international with 50,000-100,000 members involved in drug trafficking, weapons sales, murder, and extortion. Members must commit acts of violence like killing a rival gang member to join. Tattoos are used to display membership but laws have reduced their use. Questions are raised about whether El Salvador's government is respecting human rights in its efforts to improve security.