 Throughout his career, Lange was remarkable for his practical engagement in political and workers’ movements. As discussed in section 1 above, his commitment to the workers’ movement led him to participate in the second Congress of the German Workers’ Association. He formulated his political views in Die Arbeiterfrage of 1865, which in turn led him to engagement with Karl Marx, Friedrich Engels, Ferdinand Lassalle, August Bebel, Eduard Bernstein, and other significant political figures.