At least constitutionally, in the Czech Republic, the Charter of Fundamental Rights and Freedoms (https://www.usoud.cz/fileadmin/user_upload/ustavni_soud_www/Pr

At least constitutionally, in the Czech Republic, the Charter of Fundamental Rights and Freedoms (https://www.usoud.cz/fileadmin/user_upload/ustavni_soud_www/Pravni_uprava/AJ/Listina_English_version.pdf https://www.usoud.cz/fileadmin/user_upload/ustavni_soud_www/...) does not prohibit forced labour of prisoners -- this is one of the explicit exemptions to forced labour prohibition. Of course the exemption talks about "labour imposed in accordance with law", and I don't know off the top of my head what are the legal details of this.