The Congress largely backed down. Later, some members of Grupo Colina were put on trial. Fujimori signed a controversial law that granted amnesty to anyone accused of, tried for, convicted of, or sentenced for human rights violations that were committed by the armed forces or police. When a court found this law unconstitutional, Fujimori signed a new law removing the right of judicial review over amnesty laws. This second law was known as the "Barrios Altos Law" because it ensured that those members of Grupo Colina who committed the Barrios Altos massacre would be freed. Eventually, the Inter-American Court of Human Rights struck down both amnesty laws. Since the collapse of the Fujimori government, several people have been tried for Grupo Colina's crimes, including Fujimori himself, who was tried and convicted for the La Cantuta massacre and the Barrios Altos massacre. Testimony in defense of Fujimori has been offered by group leaders, Jesús Sosa Saavedra and Santiago Martin Rivas, who claim that Fujimori was an unwitting participant in the Grupo Colina's actions. Other trials have established that Grupo Colina was not an informal group of renegade officers but an organic part of the Peruvian state. Julio Salazar, former "de jure" chief of the National Intelligence Service (SIN), was sentenced to thirty-five years of prison for his role in the La Cantuta massacre. During Salazar's tenure at the SIN, Vladimiro Montesinos was the "de facto" SIN chief and national security advisor. Montesinos is currently imprisoned in the Callao Military Prison outside of Lima and faces over seventy trials for various human rights abuses, as well as charges of arms trafficking, drug trafficking, and political corruption. The operational chief of Grupo Colina, Santiago Martín Rivas, is also imprisoned. Chester-le-Street Rural District  Chester-le-Street was a rural district in County Durham, England from 1894 to 1974. It surrounded the urban district of Chester-le-Street. The district was split in 1974, under the Local Government Act 1972, with the bulk going to the new Chester-le-Street district. Part of the parishes of Birtley, Harraton and South Biddick went to the Metropolitan Borough of Sunderland, in Tyne and Wear, and Lamesley and the rest of Birtley parish went to the Metropolitan Borough of Gateshead.