The "Urgent Call for Unity" (German: Dringender Appell für die Einheit) was an appeal by the Internationaler Sozialistischer Kampfbund (ISK) to defeat the National Socialist German Workers Party. It was signed by nearly three dozen well-known German scientists, authors and artists in advance of the German federal election in July 1932.^[1]

The June 1932 appeal called for support of the Social Democratic Party (SPD) and the Communist Party (KPD) in the Reichstag election to prevent the National Socialists from gaining control of the government. The appeal was unsuccessful, and Adolf Hitler was later appointed chancellor, and the National Socialists were able to consolidate power.

The appeal was published in the ISK's newspaper, Der Funke, in response to the growing strength of the NSDAP.^[1] Placards were also put up all over Berlin.^[2]

On February 12, 1933,^[5] two weeks after Adolf Hitler was named Reichskanzler, an identical appeal was made to rally against Hitler in advance of the German federal election, March 1933. Placards appeared on February 14. This time, there were only 19 signatories, such as Heinrich Mann and Käthe Kollwitz and her husband, Karl.^{[6][note 3]}

On February 15, 1933, the day after the new placards appeared, both Mann, the head of the poetry department, and Kollwitz were forced to withdraw from the Akademie der Künste, Berlin, by Bernhard Rust,^[6] a National Socialist who became the acting head of the Prussia Ministry of Culture on February 2, 1933 and thus curator of the Akademie. Rust insisted that their presence endangered the very existence of the Akademie.

The Akademie president, Max von Schillings, called a meeting of the entire Akademie that very evening and announced the departure of Kollwitz and said that Mann would also have to quit, or he would quit himself. The minutes of the meeting report that there were protests from members because Mann was not present and had not been invited.^[6] The meeting was interrupted so that Mann could be called by telephone, and the meeting was then resumed and Mann's resignation was announced. There were protests, including one from Berlin city planner Martin Wagner, who then walked out. In the following days and months, numerous leading artists quit or were forced out of the institution. Alfons Paquet declared his solidarity in a letter on February 17. In March 1933, Paquet, Alfred Döblin and Thomas Mann (younger brother of Heinrich) quit.^[7] In April, Ricarda Huch quit. Max Liebermann, Paul Mebes, Otto Dix and Karl Schmidt-Rottluff quit in May 1933,^[6] after the book burnings. In July 1937, Ludwig Mies van der Rohe, Ernst Barlach and Ernst Ludwig Kirchner quit.

• List of Germans who resisted Nazism
• Weimar Germany

• Werner Link, "Die Geschichte des Internationalen Jugendbundes (IJB) und des Internationalen Sozialistischen Kampfbundes (ISK)." Hain, Meisenheim (1964) in Marburger Abhandlungen zur Politischen Wissenschaft, Vol. I, edited by Wolfgang Abendroth. (in German)