Since the Spartacus League in Stuttgart under the leadership of Fritz Rück and August Thalheimer refused to take part in the government, Schreiner withdrew from the Blos Cabinet on 15 November.
In 1924 he attended the military school in Moscow; in the same year he became leader of the newly founded Roter Frontkämpferbund (RFB) and editor in chief of its newspaper, the Rote Front.
In the corruption scandal concerning Willy Leow (second chairman of the RFB), Schreiner took a critical position.
In October 1932 Schreiner unexpectedly quit the KPO and then rejoined after criticism from his local group.
He was secretary of the Thälmann Committee and chief of staff of the XIII International Brigade during the Spanish Civil War.
He was a founding member of the "German American Emergency Conference" in 1942 and of the "Council for a Democratic Germany" (CDG) in 1944.
Albert Schreiner and a small group of like-minded individuals sought to establish historical seminars and institutes in the DDR which conformed to the SED's regulations.