The Hall-Hoag Collection consists of over 300,000 items documenting dissenting and extremist movements in the United States, primarily between 1950 and 2000. Gordon Hall, who assembled the collection with the assistance of Grace Hoag, gave equal weight to left- and right-wing viewpoints on every controversial subject confronted by American society in the post World War II–pre-9/11 era, from McCarthyism to Vietnam to the women’s movement and civil rights.