Convict or prison labour is another classic form of unfree labour. The forced labour of convicts has often been regarded with lack of sympathy, because of the social stigma attached to people regarded as "common criminals". In some countries and historical periods, however, prison labour has been forced upon people who have been victims of prejudice, convicted of political crimes, convicted of "victimless crimes", or people who committed theft or related offences because they lacked any other means of subsistence—categories of people who typically are entitled to compassion according to current ethical ideas.