From 1885 to 1890, he spent time in London, where he became a close friend of Friedrich Engels; in 1891, he co-authored the SPD's Erfurter Programm together with August Bebel and Eduard Bernstein.
In 1891, he co-authored the Social Democratic Party of Germany (SPD) 's Erfurt Program together with August Bebel and Eduard Bernstein. From 1885 to 1890, he spent time in London, where he became a close friend of Friedrich Engels.
From 1885 to 1890, he spent time in London, where he became a close friend of Friedrich Engels. In 1891, he co-authored the Social Democratic Party of Germany (SPD) 's Erfurt Program together with August Bebel and Eduard Bernstein.
From 1885 to 1890, he spent time in London, where he became a close friend of Friedrich Engels. In 1891, he co-authored the Social Democratic Party of Germany (SPD) 's Erfurt Program together with August Bebel and Eduard Bernstein.