 After spending nine months in prison, he was extradited by the Prussian police under anti-socialist laws and sentenced to nine additional months in prison in Berlin.Liebermann returned to London after his release in January 1880, his mental balance deeply affected by prison life.He contributed several articles to Johann Most's journal "Freiheit" and, together with Morris Winchevsky, established the Jewish Workingmen's Benefit and Educational Society.