„I am for the unity of the party – for the national and international unity of the party. But it must be a unity of socialism and socialists. The unity with opponents – with people who have other aims and other interests, is no socialist unity.“
— Wilhelm Liebknecht German socialist politician 1826 - 1900
We must strive for unity at any price and with all sacrifices. But while we are uniting and organizing, we must rid ourselves of all foreign and antagonistic elements. What would one say of a general who in the enemy’s country sought to fill the ranks of his army with recruits from the ranks of the enemy? Would that not be the height of foolishness? Very well, to take into our army – which is an army for the class struggle and the class war – opponents, soldiers with aims and interests entirely opposite to our own, – that would be madness, that would be suicide.
No Compromise – No Political Trading (1899)