Mrs. Fox, who became a Democratic Party fundraiser, lured hostesses and presidents into her orbit. She also enticed many powerful eligible bachelors, and, she hinted, also some who were not so eligible. But her most enduring attachment was to Cherif Guellal, a dashing Algerian who helped secure his country’s independence from France and served as its first post-colonial ambassador to the United States. As socialite and author Barbara Howar once wrote, Mrs. Fox contributed show-business luminaries to Guellal’s wild Georgetown parties already teeming with “the keener political minds, celebrated academicians [and] international radicals.” Guellal, whom she considered her spouse although they never wed, died in 2009.