ressing census data or by forcibly assimilating "undesirable" groups. In 1985, at the height of the last anti-Turkish assimilation campaign, a leading Bulgarian Communist Party official declared Bulgaria "a one-nation state" and affirmed that "the Bulgarian nation has no parts of other peoples and nations." After the fall of Todor Zhivkov in 1989, all the minorities in Bulgaria progressed somewhat toward self-determination and freedom of expression. New minority organizations and political parties sprang up, and minority groups began publishing their own newspapers and magazines. Non-Bulgarian nationalities regained the right--curtailed in the Zhivkov era--to use their original names, speak their language in public, and wear their national dress. In 1991 significant controversy remained, however, as to how far the rights of minorities should extend. Legislators making policy on such issues as approval of non-Bulgarian names and Turkish-language schools faced mass protests by nationalist Bulgarians, who successfully delayed liberalization of government policy on those issues. During the Zhivkov era, Bulgaria signed several friendship treaties with other Comecon nations to ease the exchange of workers. In the 1980s, for example, a large number of Bulgarians worked in the construction and timber industries of the Komi Autonomous Soviet Socialist Republic under an exchange agreement with the Soviet Union. Workers were expected to return to their own countries when their contracts ended, but they did not always do so. For example, some Vietnamese construction workers sent to Bulgaria under Comecon agreement in the 1980s remained, and in 1991 the Vietnamese population of Bulgaria was 11,000. Because they arrived completely unprepared for life in Bulgaria and began working after only one month of training and language courses, the Vietnamese who remained in Bulgaria generally received the hardest and lowest-paying jobs and often became involve...