Immigration has been in the news recently in political contexts, for example, as an issue in the presidential elections in France, and as an issue in the U.S. Congress, which is struggling to write a new immigration law.
Political aspects of immigration are classed in 325.1 Immigration. Political aspects of immigration in a specific area are classed in 325.4-325.9 International migration to and colonization in specific continents, countries, localities in modern world, e.g., 325.44 Immigration into France (built with 325 International migration and colonization plus T2--44 France, following instructions at 325.4-325.9).
Immigration laws are classed in 342.082 Entrance to and exit from national domain, where immigration is named in the including note. Immigration laws in a specific jurisdiction are classed in 342.3-342.9 Constitutional and administrative law in specific jurisdictions and areas, e.g., Immigration Made Simple: An Easy to Read Guide to the U.S. Immigration Process, classed in 342.73082 U.S. immigration law (built with 342 Constitutional and administrative law plus T2--73 United States plus 082 from 342.082 Entrance to and exit from national domain, according to the instructions under 342.3-342.9). Preliminary materials, such as bills and hearings, if considered in a legal context, are classed in the same numbers. Notation 0262 Preliminary materials from the add table under 342-347 Branches of law cannot be added because immigration is in standing room.
Interdisciplinary works about immigration that include at least some sociology (e.g., The Migration Decision and Immigration Policy) are classed in 304.82 International movement of people. Interdisciplinary works about immigration into a specific area are classed in 304.83-304.89 Migration; for example, Immigration and the Transformation of Europe is classed in 304.84 Immigration into Europe from many areas (built with 304.8 Movement of people plus T2--4 Europe, following instructions at 304.83-304.89).