After the end of World War II, Olechowski worked extensively to publicize and have the Russian authorities acknowledge their role in the Katn massacres as well as other atrocities against imprisoned Poles.
After the end of World War II, Olechowski moved to London and then on to Canada. He worked extensively to publicize and have the Russian authorities acknowledge their role in the Katn massacres as well as other atrocities against imprisoned Poles.