Russian steamship Subotnik suspected of illegal arms trade according to the Weekly Intelligence Summary No. 5 dated 5 February 1921

An item reported the receive on 31 January of a report sent by Naval Control, Berlin, Germany that the Russian steamship Subotnik departed on 30 January Hamburg, Germany bound for Stettin [Germany, nowadays Poland] without informing the N.I.A.C.C. or permission of the German Port Authorities. It was believed that she was loaded with war material for Russia so the stop at Stettin was doubtful.

Source

The National Archives, Kew Gardens, England CAB-24-119-53