MS2 in the comments to COL Lang's recent post about Marshall asked about where to go to get started reading about these things. In regards to the Senator McCarthy material I highly recommend Oshinsky's biography entitled A Conspiracy So Immense: The World of Joe McCarthy. I found it very easy to read, well researched, and the author, clearly dealing with a controversial subject, actually manages to show Senator McCarthy's humanity while clearly articulating how far off the rails he had gone.
The transcript for the Army/McCarthy Hearings can be found at this link.
* Adam L. Silverman is the Culture and Foreign Language Advisor at the US Army War College. The views expressed here are my own and do not necessarily reflect those of the US Army War College and/or the US Army.