Series I contains correspondence with the bulk of the letters from the years leading up to and following Lovell's 1981 expulsion from the Socialist Workers Party. Much of it concerns the issues and events leading up to his expulsion, the founding of the Fourth Internationalist Tendency, and the publishing of the Bulletin in Defense of Marxism. Series II contains manuscripts of Lovell's numerous articles, reviews, speeches, class lectures, reports for and on the SWP, most concerned with the labor movement. Many of the lectures were given at classes for union militants held around the country. There are also topical files on major labor movement events, controversies, rank-and-file movements, and on relevant economic topics.