As part of my retirement from the Agency package I got a booklet concerning the VENONA project. I came away feeling that McCarthy was vindicated. The State Department was riddled with comsymps.
No, Ax, Venona did not vindicate McCarthy.
See these two articles by Dr. John Earl Haynes:
Senator Joseph McCarthys Lists and Venona
http://www.johnearlhaynes.org/page62.html
(b) Exchange with Arthur Herman re: Venona
http://www.johnearlhaynes.org/page58.html
In addition, the FBI’s Security Index file falsifies your premise about the State Department — as does the file which the FBI opened which dealt with McCarthy’s accusations, i.e. HQ 121-23278.