A federal judge has blocked the Internal Revenue Service from disclosing taxpayers’ confidential home address information to U.S. Immigration and Customs Enforcement agents carrying out President Donald Trump’s mass deportation agenda. U.S. District Senior Judge Colleen Kollar-Kotelly of the District of Columbia granted a stay and preliminary injunction on Nov. 21, ruling an address-sharing agreement between the IRS and ICE likely violates the Administrative Procedure Act and federal tax codes. “Plaintiffs have shown that the IRS committed multiple violations of Internal Revenue Code Section 6103(i)(2) when it disclosed confidential taxpayer address information to ICE on August 7, 2025,” Kollar-Kotelly wrote in her 94-page memorandum opinion. An ICE official received address information for 47,000 taxpayers after the agency requested IRS data on more than 1 million taxpayers, according to Kollar-Kotelly’s decision. “Plaintiffs have shown a substantial likelihood that the IRS’s implementation of the Address-Sharing Policy was both arbitrary and capricious and contrary to law,” the judge added. “The IRS failed to acknowledge its change in policy and failed to provide a reasoned explanation for its implementation of the Address-Sharing Policy.” Former Big Law attorneys at legal advocacy organization Democracy Forward helped the nonprofit Center for Taxpayer Rights and labor union plaintiffs secure the extraordinary relief as the litigation plays out. “This is an important win for millions of people in America whose information has been threatened by the Trump-Vance administration and represents the first injunction against this unlawful data sharing,” Skye Perryman, president and CEO of Democracy Forward, said in a statement. “The privacy laws enacted in the post-Watergate era exist to prevent abuses of power like this and yet leaders in the IRS and ICE launched this effort.” Perryman began her legal career in litigation roles at Wilmer Cutler Pickering Hale and Dorr and Covington & Burling before becoming Democracy Forward’s chief executive. In addition to Perryman, other Democracy Forward litigators representing CTR include former Paul, Weiss, Rifkind, Wharton & Garrison litigation associate Daniel A. McGrath; former Hogan Lovells senior associate Maddy Gitomer; former Consumer Financial Protection Bureau senior enforcement attorney Johanna M. Hickman; former U.S. Department of Justice trial attorney Robin F. Thurston; and former CFPB deputy general counsel Steven Y. Bressler. “Democracy Forward is honored to represent this expansive coalition of brave plaintiffs holding the administration accountable and protecting the privacy of millions of Americans,” Perryman added. “At every turn, activist judges have attempted to thwart the President’s mandate to carry out mass deportations of the worst of the worst criminal illegal aliens,” a U.S. Department of Homeland Security spokesperson said in a statement. “Now, this judge is trying to overturn established precedent that the Memorandum of Understanding between the IRS and DHS does not violate the Internal Revenue Code.” “Information sharing across agencies is essential to identify who is in our country, including violent criminals,” the DHS spokesperson added. “With the IRS information specifically, DHS plans to focus on enforcing long-neglected criminal laws that apply to illegal aliens but which the Biden Administration ignored.”