Abstract: Papers of Erwin Knoll, an outspoken advocate for free speech and nonviolence, documenting his career as a journalist for Editor & Publisher (1948-1953, while an evening student at New York University) and The Washington Post (1957-1963), White House correspondent for Newhouse News Service (1963-1968), host of two nationally syndicated radio shows, panel member on the MacNeil/Lehrer News Hour, and editor of The Progressive magazine (1973-1994). The Progressive papers include documentation of United States of America v. The Progressive, Inc., his First Amendment battle fought and won against the U.S. government, which in 1979 tried to restrain The Progressive from publishing an article with the hydrogen bomb formula obtained from publicly available sources.