Nazis (see Nazi camps) and Stalin (see Gulag) used them both as a source of cheap labor force and as indirect extermination camps.
Labor camps were known not only for totalitarian regimes. Imperial Russia had a system of penal servitude called katorga in Russian.
Unlike concentration camps, "katorga" was within normal judicial system of (Imperial) Russia, but in all remaining respects both share the main features:
Katorga
Katorgas were established in underpopulated areas of Siberia and Russian Far East. Since these times Siberia had gained its fearful connotation of punishment.