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Incustomary international law, anenemy alien is anyalien native, citizen, denizen or subject of any foreign nation or government with which a domestic nation or government is in conflict and who is liable to be apprehended, restrained, secured and removed. Usually, the countries are in a state of declared war.

InAustralia, in the wake of the outbreak of World War II, Jewish refugees and others fleeing theNazis were classified as "enemy aliens" upon their arrival in Australia if they arrived with Germanidentity papers.[1][2][3] Australian law in 1939 designated people "enemy aliens" if they were Germans or were Australians who had been born in Germany; later, it covered Italians and Japanese as well.[4] The Australian government would therefore intern them, sometimes for years until the war ended, in camps such as the isolatedTatura Internment Camp 3 D which held approximately 300 internees thus deemed "enemy aliens", mostly families, including children as young as two years of age, such asEva Duldig — who two decades later represented the country that had interned her in tennis at Wimbledon.[5][6][7]
That internment camp was opened in 1940.[8] It was located nearShepparton, in the northern part of thestate of Victoria.[1][9][3] There, armed soldiers manned watchtowers and scanned the camp that was bordered by a barbed wire fence with searchlights, and other armed soldiers patrolled the camp.[10] Petitions by many of those interned to Australian politicians, stressing that they were Jewish refugees (such asKarl Duldig,Slawa Duldig, and their toddler) and therefore being unjustly imprisoned, had no effect.[10]
Since 1914,[11] theWar Measures Act was a statute of theParliament of Canada that provided for internment during war, invasion, orinsurrection. The Act was brought into force three times inCanadian history: during Canada's firstnational internment operations of 1914–1920, the Second World War'sinternment of Japanese Canadians, and in the 1970October Crisis.[12] In 1988, it was repealed and replaced by theEmergencies Act.
The terminology used in the act is "alien enemy".[13]
Ilag were internment camps established by theGerman Army inWorld War II to holdAllied civilians, caught in areas that were occupied by the German Army. They included United States citizens caught in Europe by surprise when war was declared in December 1941, and citizens of theBritish Commonwealth caught in areas engulfed by theBlitzkrieg.
In 1919, The Aliens Restriction (Amendment) Act, 1919 used the words "other than, former enemy aliens".[14]
In 1924, to avoid disabling German citizen and German companies, a repeal occurred.[14]
At the outbreak of World War II in 1939, the United Kingdom had become a place of refuge for people who had fled Nazi persecution, including Jews and political refugees. At first, with the outbreak of war, the British government – in accordance with its policy ofDefence Regulation 18B – placed these refugees with other enemy aliens regardless of their political allegiances. Later on, when Italy also declared war on Britain, someBritish Italians were also interned as enemy aliens.[15]
TheIsle of Man, relatively isolated from the British mainland and with a useful amount of holiday accommodation, was used to provide housing for the "Alien Civilians" (as it had in World War I). There were also efforts to move internees toCanada. In July 1940, theSS Arandora Star was torpedoed by a German U-boat and sunk while transporting Italian and German aliens toNorth America; 743 died.[16] The 813 surviving prisoners were subsequently included in the 2,500 men transported byHMTDunera for internment inAustralia.[citation needed]
ThePioneer Corps was the only British unit that enemy aliens could serve in early on in the war. Many thousands of Germans and Austrians joined the Pioneer Corps to assist the Allied war efforts and liberation of their home countries. These were mainly Jews and political opponents of the Nazi regime who had fled to Britain while it was still possible, and included the cinematographerKen Adam, writerGeorge Clare and publisherRobert Maxwell. These men – often dubbed "The King's Most Loyal Enemy Aliens" – later moved on to serve in fighting units. Some were recruited bySpecial Operations Executive as secret agents.[17][18]
Serving as German nationals in the British forces was particularly dangerous, since, in case of taken captive, with a high probability they would have been executed as traitors by the Germans. The number of German-born Jews joining the British forces was exceptionally high; by the end of the war, one in seven Jewish refugees from Germany had joined the British Army. Their profound knowledge of the German language and customs proved useful. Many of them served in the administration of the British occupation army in Germany and Austria after the war.[19]
Since 1948, British law also contain the "enemy alien" wording in the British Nationality Act 1948 which states that "Provided that a person shall not be such a citizen by virtue of this section if at the time of his birth— (...) his father is an enemy alien and the birth occurs in a place then under occupation by the enemy.".[20]
Now, the UK is party to theFourth Geneva Convention which deals with enemy nationality and enemy aliens.[21]

A well-known example of enemy aliens was that of the Japanese citizens residing in the United States duringWorld War II. Many of these Japanese and Japanese-Americans were imprisoned ininternment camps byPresident Franklin D. Roosevelt during wartime, alongside many German- and Italian-Americans. However, manyJapanese-Americans and Italian-Americans were not actually "aliens", as they held American citizenship. The term "enemy alien" referred only to non-American citizens who were nationals ofAxis countries. Included in this number were thousands of resident aliens who were prohibited from applying for citizenship byrace-based naturalization laws; when war was declared against their native countries, their status changed from "resident" to "enemy" alien. Therefore, German American, Italian American, and Japanese American permanent residents were classified as enemy aliens and interned as such.
In total 10,905 Italian Americans and approximately 110,000 Japanese Americans were interned in many different camps and sites across the country. German Americans were held in more than 50 different locations.[citation needed]
Citizens of an enemy country who lived in the United States during World War II were required to have an "Enemy Alien" card, and to register monthly with the authorities.[citation needed]
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