February 22, 1921 (, yau fifteenth), Kautsky and founder of the second half international.

1921 22, Kautsky Independent Democratic Party of Germany, the 13 countries of the British Independent Labour Party "Centrist Socialist Party meeting in Vienna to establish the Socialist International Workers' Federation, formally do not actually follow the opportunist line of the second international late and the Second International. Because it advertised between international and international political standing, it is also referred to as the second half of the international.