"Liquidation of the Jews on Polish soil," March 1943

Antony Polonsky's essay in this volume (p.61) cites the underground journal Barykada from March 1943, published by the Konfederacja Narodu (Confederation of the Nation) as follows:

the liquidation of the Jews on Polish soil is of great significance for our future development, since it will free us from several million parasites.

Apparently, not only did this organization know that Jews were being exterminated, but also that it was occurring on Polish soil.