When Social Democratic Party of Germany regained legal status in 1890, Engels published “Farewell
Letter to the Readers of the Sozialdemokrat” on the final issue of Der Sozialdemokrat. In the letter, Engels spoke
highly of the important role of the newspaper which fighting for freedom of the press in society and protecting
freedom of speech within workers’ party, and he made the point that Social Democrats should not renounce the
illegal methods of struggle in the legal period so as to clarify the struggle strategy for German labor movement.