The socialist physicist who stepped aside for Einstein and assassinated a prime minister

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Friedrich Adler was a man of radical contradictions. A brilliant physicist who championed Albert Einstein’s career, he eventually abandoned science for revolutionary politics. In 1916, he committed a shocking act of political violence that transformed him from a quiet intellectual into a symbol of resistance against the Great War.

Born in 1879 to the founder of the Austrian Social Democratic Workers' Party, Adler was deeply embedded in the intellectual circles of his time. While studying in Zurich, he became a close friend of Albert Einstein. In 1909, when Adler was considered for a physics chair, he recognized Einstein’s superior expertise and lobbied for his friend to receive the appointment instead. Adler’s own intellectual pursuits were diverse; he published philosophical critiques of Ernst Mach, which drew the ire of Vladimir Lenin, who dismissed him as a naive lecturer.

Adler’s trajectory shifted sharply toward activism as the political climate in Austria-Hungary deteriorated. By 1916, he had become a vocal critic of his own party’s support for World War I and the authoritarian rule of Minister-President Count Karl von Stürgkh, who had blocked the Austrian parliament from meeting since 1913. On 21 October 1916, Adler walked into a Viennese hotel and shot Stürgkh three times. While his party initially labeled the act incomprehensible, international observers saw it as a desperate, final stand against tyranny.

The aftermath of the assassination saw Adler use his trial in 1917 as a platform to denounce the war and reformist politics. Although sentenced to death, his sentence was commuted by Emperor Charles I, and he was released as the monarchy collapsed in 1918. In the following decades, he remained a central figure in international socialism, serving as secretary-general of the Labour and Socialist International until 1940. He spent the war years in New York, eventually retiring to Switzerland, where he died in 1960 at the age of 80.

Adler’s legacy remains complex. He was a man who navigated the intersection of hard science and hard politics, ultimately choosing the latter at a immense personal cost. His life serves as a window into the turbulent ideological shifts of the early 20th century, from the rise of socialist movements to the eventual collapse of the Austro-Hungarian Empire and the subsequent rise of fascism.

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