While in prison, Kōtoku, now an avowed anarchist, encouraged him to research the work of Mikhail Bakunin and Peter Kropotkin. Ōsugi was particularly receptive to Kropotkin's scientific approach to anarchy, and he translated Kropotkin's autobiography in 1920. His arrest as part of the Red Flag Incident handed him his heaviest prison term, but it saved him and others convicted at the time from being associated with the High Treason Incident ("Taigyaku Jiken") of 1910. At the trials, twelve anarchists, including Kōtoku Shūsui and one of the few anarchists found not guilty during the Red Flag trials, were found guilty of conspiracy to assassinate the Emperor and were sentenced to death. Ōsugi encountered the defendants in prison but was afraid to speak to them too loudly. Kōtoku, nearly deaf, was unable to hear him. Ōsugi also encountered their executioner, who retired after their executions. After this experience, he never challenged the state with open calls for violent revolution, and his future essays instead focused on individualism and criticisms of capitalism. He would not be arrested again until 1919: for assaulting a police officer, for which he received a 3-month term. He was also briefly held in detention in France in 1922 before being deported to Japan. Ōsugi was married to Hori Yasuko in September 1906, but later pursued a relationship with Kamichika Ichiko and author Noe Itō as part of his philosophical and political beliefs in egoism and free love. He first met Ichiko, a 26-year-old reporter for the "Tokyo Nichi Nichi Shimbun", in April 1914 at a meeting of his Sanjikarizumu Kenkyūkai ("Syndicalism Study Society") through two of his anarchist associates, Miyajima Sukeo and his wife Reiko. Initially Ōsugi made no mention of her in his writings. But in 1915, he and his wife moved to Zushi, Kanagawa Prefecture, to publish the second "Kindai Shisō". On Fridays he would commute to Tokyo to teach his Furansu Bungaku Kenkyūkai ("French Literature Study Society") classes and he'd spend the night at Ichiko's house. This led to their affair, which was an open secret by that December. During this time he encountered Itō on several occasions, as both were anarchists who mingled in similar circles.