The Katyn Forest massacre was when the Soviets brutally mudured about 25,000 Polish officers and civilians during World War II, around April 1940. Its significance wah that i was easier for communists to take the control over Poland and install a communistic government after the end of WWII.

Yes, they did and all historians would agree that the Soviets did commit the massacre at Katyn.

There was a massacre of Polish officers in the Katyn forest ~ see related link below .

http://www.electronicmuseum.ca/Poland-WW2/katyn_memorial_wall/kmw.html - possibly only confirmed victims. As long as the exact number of executed persons is not known, it is not possible to provide a full list.

Henri de Montfort has written:

'Le massacre de Katyn'