An immigration policy is any policy of a state that deals with the transit of persons across its borders into the country, but especially those that intend to work and stay in the country. Immigration policies can range from allowing no migration at all to allowing most types of migration, such as free immigration. Often, racial or religious bias is tied to immigration policy (for example, a country might only allow commonwealth citizens admission). Ethnic relations policy within a country can usually be broadly categorized as either 'assimilationist' or 'multiculturalist'.