What were Soviet Union forced labor camps called?

I have read that they were referred to as "katorga" (forced labour) camps. Source: Wikipedia article on Dostoevsky, who spent several years in such a camp near Omsk. I am preparing a presentation on Dostoevsky, so am interested in getting the term right. However, I have not been able to confirm this as a correct Russian Word with a friend who is fluent in the language.

Alex McKenzie, Hertford, England