...McCarthy had the list in his possession when he set forth some 70-plus security cases on the floor of the Senate in February 1950. Subsequently he provided their names in writing to the Senate committee that looked into the matter, plus a supplementary list of 2-dozen other suspects for a total of more than 100 names presented to the Senate.
As to the disappearance of the records, try this hint: the Democrats controlled the Senate at that time.
To the point:
...The Wheeling argument mainly concerned the number of cases he claimed to have, his opponents saying he claimed 205, McCarthy responding that he in fact claimed 57 (as noted, a number that would grow substantially by the time he addressed the Senate roughly ten days later). Without getting too far into the weeds on this, the Democratic Senate sent staffers up to Wheeling to dig out the facts about the issue, as part of an investigation aimed at throwing McCarthy out of Congress. When the staffers came back, they filed a 40-page report that in essence said McCarthy was right about the numbers and his critics were mistaken
Oh, by the way:
....the[ staff's] report would be buried and also vanish from the public record, while a perjury charge against McCarthy for lying about the numbers would be quietly dropped from the discussion
Just co-incidence, of course.
Will, K-hammer, et al could read the book, or read the Venona papers; but it's so much easier to parrot lies, I suppose.