and their descendants or Estonian citizens prior to June 16, 1940, and their descendants. Citizens of the Soviet Union who had moved to Estonia or Latvia while they were part of the Soviet Union did not receive citizenship automatically in 1991, and neither did their descendants. They had to apply for naturalisation as immigrants, a process that included a knowledge test and a language test in Estonian or Latvian. Children born after Latvia re-established independence (August 21, 1991), to parents who are both non-citizens, are also entitled to citizenship at the request of at least one of the parents. These criteria mainly excluded ethnic Russians. Most were unable to pass the language test required. Russia has a visa waiver for stateless persons living in Estonia and Latvia, while Estonian and Latvian citizens need to obtain a visa to enter Russia. These stateless persons can also travel freely within the Schengen area, but they are not permitted to work within the European Union. , more than 267,000 of residents of Latvia, and 91,000 of residents of Estonia, were stateless. Greece Article 19 of the Greek Citizenship Code (Law 3370 of 1955) stated: "A person of non-Greek ethnic origin leaving Greece without the intention of returning may be declared as having lost Greek citizenship. This also applies to a person of non-Greek ethnic origin born and domiciled abroad. Minor children living abroad may be declared as having lost Greek citizenship if both their parents, or the surviving parent, have lost it as well." (The Minister of the Interior decides such cases, with the concurring opinion of the Citizenship Council.). Article 19 was abolished in 1998, but no provision was established for restoring citizenship to people who had lost it. Interior Minister Alekos Papadopoulos stated that, since the article's introduction in 1955, 60,000 Greeks had lost their citizenship because of it, many of these people moved and adopted the nationality of another country. However, an estimated 300–1,000 people remain stateless in Greece (primarily minorities in Thrace, some of whom never settled abroad) and other former Greek citizens are stateless outside the country (an estimated 1,400 in Turkey and an unknown number elsewhere). Stateless individuals in Greece have had difficulty receiving social services like health care and education. Until December 1997, they were denied the protection of the 1954 U.N. Convention Relating to the Status of Stateless Persons, which Greece ratified in 1975. Then,