 Those interned in the camps were used as slave labour.From July 1922, intellectuals deemed to be opposing the Bolshevik government were exiled to inhospitable regions or deported from Russia altogether; Lenin personally scrutinised the lists of those to be dealt with in this manner.In May 1922, Lenin issued a decree calling for the execution of anti-Bolshevik priests, causing between 14,000 and 20,000 deaths.