Our client, Nizar Trabelsi, was being held in the United States against his will. The federal government brought him here from Belgium in 2013 and charged him with terrorism-related crimes. At trial, the government’s case failed: a federal jury found Mr. Trabelsi not guilty. But instead of allowing Mr. Trabelsi to return to Belgium after his acquittal, the United States placed him in highly restrictive immigration detention and began an ongoing effort to force him to Tunisia, where he was born and where he would very likely be tortured.   Mr. Trabelsi’s detention violated the Constitution, immigration law, and the extradition treaty between the United States and Belgium. Through this lawsuit, he sought to return to Belgium, and he demanded an immediate improvement of his detention conditions. In 2025, at long last, the United States removed him from detention and returned him to Belgium.

On April 11, 2025, the ACLU and ACLU of Maine filed a lawsuit on behalf of two human rights advocates who, because of an executive order signed by President Trump, have been forced to stop humanitarian work with the International Criminal Court.

In 2021, the Department of Homeland Security announced the establishment of the Center for Prevention Programs and Partnerships, also known as CP3, and a domestic terrorism branch within the Office of Intelligence and Analysis. These initiatives are a product of DHS's new measures to address domestic violent extremism, and little is known about these programs and the effects they'll have on members of the public. DHS has a history of similar harmful programs, which have targeted communities of color, immigrants and Muslim communities. The public has a right to know about the impacts of CP3 and the I&A domestic terrorism branch on the civil rights, liberties and privacy of communities of color, immigrants and other marginalized communities. In 2022, the ACLU submitted a FOIA request to compel the government to release information about these initiatives. It is imperative that the public gain a greater understanding about the policies, practices, methods and goals of both CP3 and the I&A domestic terrorism branch. After DHS produced records, the ACLU dismissed the case in February 2026.

On October 14, 2025, the United States military carried out an illegal missile strike that killed Chad Joseph and Rishi Samaroo, two Trinidadian men who were traveling by boat from Venezuela to their homes in Las Cuevas, Trinidad and Tobago. The American Civil Liberties Union, the Center for Constitutional Rights, the American Civil Liberties Union of Massachusetts, and Professor Jonathan Hafetz of Seton Hall Law School filed suit on behalf of Lenore Burnley, Mr. Joseph’s mother, and Sallycar Korasingh, Mr. Samaroo’s sister, seeking redress and accountability for these extrajudicial killings pursuant to the Death on the High Seas Act and the Alien Tort Statute.