 Complete the following phrase:  On June 2001, Yury Bandazhevsky was sentenced to eight years imprisonment on the grounds that he had received bribes from students parents. The institutes Deputy Director, Vladimir Ravkov, also received an eight-year prison sentence. Bandazhevskys lawyer claimed that he had been convicted on the basis of two testimonies made under duress, without any material evidence. According to many human rights groups Dr. Bandazhevsky was a prisoner of conscience. Amnesty International has stated on their website, His conviction was widely believed to be related to his scientific research into the 