The Alien Enemies Act (officially "An Act Respecting Alien Enemies") was passed to supplement the Alien Friends Act, granting the government additional powers to regulate the activity of foreigners in times of war or invasion. Under this law, the president could authorize the arrest, relocation, or deportation of any male over the age of 14 who hailed from a foreign enemy country. It also provided some legal protections for those subject to the law. Unlike the other acts, this act was largely unopposed by the Democratic-Republicans. The Alien Enemies Act did not contain a
sunset clause and has sustained force and effect, codified as sections 4067 to 4070 of the
Revised Statutes (50 U.S.C. 21–24).
Invocations of the Alien Enemies Act Following the resolution of the Quasi War in 1800, and up until the second administration of President Trump in 2025, the Alien Enemies Act was invoked by the United States executive on three occasions.
War of 1812 President
James Madison invoked the act against British nationals during the
War of 1812, and ordered them to report to local authorities in order to undertake additional duties. during
World War I World War I President
Woodrow Wilson invoked the act against nationals of the
Central Powers during
World War I. In 1918, an amendment to the act struck the provision restricting the law to males.
World War II On December 7, 1941, in response to the
attack on Pearl Harbor, President
Franklin D. Roosevelt used the authority of the revised Alien Enemies Act to make
presidential proclamations #2525 (Alien Enemies – Japanese), #2526 (Alien Enemies – German), and #2527 (Alien Enemies – Italian), in order to apprehend, restrain, secure, and remove Japanese, German, and Italian foreigners. However, most of the 120,000 persons of Japanese descent incarcerated in U.S. internment camps were U.S. citizens detained solely on the basis of their Japanese ancestry, under the authority of
Executive Order 9066 issued by Roosevelt early in 1942. The order was issued on the basis of wartime and national defense statutes unrelated to the Alien Enemies Act, and while deployed primarily against Japanese Americans did lead to the detention of smaller numbers of U.S. citizens of German and Italian descent. Hostilities with Germany and Italy ended in May 1945, and President
Harry S. Truman issued presidential proclamation #2655 on July 14. The proclamation gave the
attorney general authority regarding enemy aliens within the
continental United States, to decide whether they are "dangerous to the public peace and safety of the United States," to order them removed, and to create regulations governing their removal, citing the Alien Enemies Act. On September 8, 1945, Truman issued presidential proclamation #2662, which authorized the
secretary of state to remove enemy aliens that had been sent to the United States from
Latin American countries. On April 10, 1946, Truman's proclamation #2685 modified previous proclamations, and set a 30-day deadline for removal. In
Ludecke v. Watkins (1948), the Supreme Court interpreted the time of release under the Alien Enemies Act. German alien
Kurt G. W. Lüdecke was detained on December 8, 1941, under Proclamation 2526, and continued to be held after cessation of hostilities. In 1947, Lüdecke petitioned for a
writ of habeas corpus to order his release, after the attorney general ordered him deported. The court ruled 5–4 to affirm the district court and appellate decisions to deny the writ of habeas corpus. The Court also concluded that the Alien Enemies Act allowed for detainment beyond the time hostilities ceased until an actual treaty was signed with the hostile nation or government or the until the president determines that hostilities have concluded. President
Ronald Reagan signed the
Civil Liberties Act of 1988, which conceded that the internment of Japanese Americans had been based on "race prejudice, war
hysteria, and a failure of political leadership", and authorizing compensation for survivors.
2025 peacetime invocation against Venezuelans On September 20, 2024, amid
increased numbers of Venezuelan asylum seekers seeking refuge in the United States, then-nominee
Donald Trump announced that if elected president for a second term he would invoke the Alien Enemies Act to expedite the removal of foreigners and criminal networks operating in the United States. On October 27, 2024, he again mentioned the Alien Enemies Act during a
campaign rally held at
Madison Square Garden, claiming that he would use it to remove undocumented migrants operating within gangs and criminal networks on "day one" of his presidency. Trump repeated his intentions in his
second inaugural address on January 20, 2025, and on March 14, he signed
Presidential Proclamation 10903 invoking the Alien Enemies Act against what he termed an invasion being perpetrated or attempted by the Venezuelan criminal gang
Tren de Aragua.
Attorney General Pam Bondi signed "Guidance For Implementing the
Alien Enemies Act", dated 14 March 2025, which directs immigration enforcement to obtain a document from an
executive branch immigration officer,
without a warrant from a
judicial branch judge and authorized that "where circumstances render it impracticable", immigration enforcement has the authority to enter a residence without any document. The memo also said "The alien is not entitled to a hearing, appeal, or
judicial review". The day after signing the proclamation, the administration conducted the
March 2025 Venezuelan deportations to the
Terrorism Confinement Center (CECOT) in
El Salvador. Trump's executive order was temporarily blocked the same day by
District of Columbia District Court Judge
James Boasberg, following a lawsuit,
J.G.G. v. Trump, seeking to stop the deportations. On April 7, 2025, the
U.S. Supreme Court vacated Judge Boasberg's
temporary restraining order and held that the plaintiffs must bring the lawsuit in Texas, where they were being held, not in Washington, D.C. The court also ruled that the government must provide sufficient notice to the plaintiffs and an opportunity to challenge the deportation. The ruling did not address the constitutionality of the deportation. On April 19, 2025, in a signal that the majority of justices did not trust that the Trump administration was complying with the April 7 ruling, the Supreme Court issued an emergency late-night order in
A.A.R.P. v. Trump, halting the deportation process in the
Northern District of Texas. According to court filings, the government intended to fly the Venezuelan detainees out of the country within 24 hours. == Naturalization Act ==