United States. Department of the Treasury. "Internal Revenue Statement on Subversive Groups, February 4, 1948," in United States. Department of the Treasury. "Volume 71," Press Releases of the United States Department of the Treasury (January 2, 1948 - March 31, 1948) : 180-181. https://fraser.stlouisfed.org/title/6111/item/586914/toc/569749 , accessed on April 25, 2024.