Your network editor has reposted this from H-Announce. The byline reflects the original authorship.
H-Hoac is the H-Net network for Historians of American Communism.
For more details see my FBI files at:
Studies in Intelligence, Volume 66, No. 1 (March 2022)
"The Challenges of Espionage and Counterespionage Operations: Running SOLO: FBI’s Case of Morris and Jack Childs, 1952–77", by Harvey Klehr and John Earl Haynes