Well, based on my knowledge, that would be General Monty, in particular.
Churchill opposed international WW II Katyn investigation
13.09.2012 17:55
Winston Churchill agreed with Stalin that no International Red Cross investigation should be carried out in German occupied territory into the Katyn massacre, show US declassified files.
http://www.thenews.pl/1/10/Artykul/112127,Churchill-opposed-international-WW-II-Katyn-investigation