This field report was assigned the following topical and geographical subject headings by the RFE/RL: Czechoslovakia; Ethnic Minorities; Industry -- Jachymov; Industry -- Mining; Prisons and Camps -- Locations; Industry -- Uranium; Prisons and Camps -- Atrocities; Prisons and Camps -- Personnel and Guards; Prisons and Camps -- Jachymov; Prisons and Camps -- Security Meas