OpinionViewpointsFrom Radical Leftist to Conservative Activist: Remembering David HorowitzCopyFacebookXTruthGettrLinkedInTelegramEmailSaveDavid Horowitz speaking at CPAC in Washington, D.C., on Feb. 12, 2011. Gage Skidmore, CC BY-SA 3.0, via Wikimedia CommonsBy Jacob Adams5/10/2025Updated: 5/13/2025PrintX 10:00CommentaryDavid Horowitz, the radical leftist-turned-conservative activist and author, died Tuesday at the age of 86.