[4][5] Although Karl's father worked as a secretary in a city hall bureau, he was deeply devoted to studying the philosophy of Leibniz in his private life.

[6] Longing for a more urban and intellectual life, Carl August made the decision to relocate his family west, to a village just outside Meiningen in the Thuringen region, when Karl was eleven years old.

[7] The move not only allowed the elder Korsch to obtain employment at a local bank (where he eventually rose to the position of vice president), it also gave his children the opportunity to receive a better education.

When he was not occupied with his studies, Korsch was extremely active in the Freie Studenten, a left-of-center student group which pushed for further liberalization of the school's code of behavior.

In addition, Korsch organized and participated in lectures that featured prominent socialist speakers such as Eduard Bernstein and Karl Liebknecht.

The extent of his extracurricular activities did not seem to have the slightest detrimental effect on Korsch's academic performance since he managed to earn his doctor of law from the University of Jena's in 1910.

His thesis title was Die Anwendung der Beweislastregeln im Zivilprozess und das qualifizierte Geständnis (The application of the burden of proof in civil cases and the qualified confession).

Korsch received a grant in 1912 to travel to England and work on translating and writing a commentary to a legal text by Sir Ernest Schuster.

[9] More important than these official accolades, Korsch's strong moral character and reputation for bravery under fire helped him garner the respect of many of the men in his company.

Korsch focused his studies and writings on working-out a replacement economic system for workers' councils to implement across Germany, published under the title What is Socialization?

He served in the Second Frölich Cabinet for 27 days during the German October until President Friedrich Ebert issued a Reichsexekution, sending the Reichswehr to forcibly dissolve the government.

Earlier that year, he and Ernst Schwarz had formed the Entschiedene Linke (Determined Left), an opposition faction within the party that had initially attracted 7,000 members.

Fabian had been working with Dr. (Anton) Roy Ganz of the Swiss Police to investigate the activities of Hans Wesemann, a former Social Democrat journalist who had become a Nazi agent.

In 1936, he settled in the United States with his wife, teaching at Tulane University, New Orleans, and working at the International Institute for Social Research, New York City.

"[17] Korsch was especially concerned that Marxist theory was losing its precision and validity – in the words of the day, becoming "vulgarized" – within the upper echelons of the various socialist organizations.

It commences with a quote from Vladimir Lenin's On the Significance of Militant Materialism: "We must organize a systematic study of the Hegelian dialectic from a materialist standpoint."

Published in 1923, Marxism and Philosophy was strongly opposed by Party faithful and other left-wing figures, including Karl Kautsky and Grigory Zinoviev.

[24][25] Korsch also instructed Felix Weil, the founder of the Institute for Social Research, from which the highly influential Frankfurt School was to emerge.