This primary source comes from the Records of the Central Intelligence Agency.
Full Citation: Strength of Communist Parties Outside the United States - June 1955; 3/1955; Published Maps, 1947 - 2015; Records of the Central Intelligence Agency, Record Group 263; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/strength-of-communist-parties-outside-the-united-states-june-1955, May 17, 2024]