Grover Furr has examined the archives and found, as did others, that the they showed how grotesque the Cold War propaganda against the USSR was. Robert Conquest had to defend himself by pointing that he had stated clearly that some of his assertions were not based on fact.

Of course many who quoted him, left that out.

As for the "Moscow Trials" they spoke for themselves. One only needs to point out _what_ was not true. No one has done that.
The sources in this book check out - after all it was published for a sceptical western audience...

Today, after que socialist goverment fall in USSR and after many historic archives be opened is clear that these men criticized int his book were victins of a sadic psycopathic leader and not traitor as the book try to expose.