Was JP Sartre blind to Stalin's excesses prior to converting in 1967?

Oct 2013
Monza, Italy
1 - The Moscow trials had been widely publicized
Right, just asking; do you have any specific references on how was the reception of these facts - like for example also the Holomodor - among Western intellectuals? I remember that even people like Shaw or Croce (a classic liberal) expressed admiration for Stalin, I ask myself what did they intend?