Among the causes which brought the others to so much unanimity was undoubtedly the establishment of the German Empire in 1871, which was viewed with universal aversion by socialists of every shade. On the outbreak of the war, Schweitzer and the members of the original League gave their sympathies warmly to the arms of their country, and the Social Democratic party was nearly equally divided on the subject; but after the foundation of the French Republic, they all with one consent declared that the war ought now to cease, and the socialist deputies, no matter which organization they belonged to, voted without exception against granting supplies for its continuance. They were likewise opposed to the recognition of the title of Emperor and to the constitution of the Empire, and indeed as republicans they could not be anything else. From a recollection mainly of these votes Prince Bismarck considered the movement to be unpatriotic and hostile to the Empire, and accordingly suppressed its propaganda in 1878, when its growth seemed likely to prove a serious danger to an Empire whose stability was still far from being assured by any experience of its advantages. The socialists retorted upon this policy at their congress at Wyden, Switzerland, in 1880, by striking out of their programme the limitation of proceeding by legal means, on the ground that the action of the Government having made legal means impracticable, no resource was left but to meet force by force. They thus threw aside the last shred of the practical policy of Lassalle, and stood out thenceforth as a party of international revolution.
The movement could, however, hardly help becoming international; not, as some allege, because this is a peculiarity of revolutionary parties; on the contrary, other parties may also exhibit it. What, for example, was the Holy Alliance but an international league of the monarchical and aristocratic parties against the advance of popular rights? Nor is it a peculiarity of the present time only. No doubt the increased inter-communication and inter-dependence between countries now facilitates its development. There are no longer nations in Europe, said Heine, but only parties. But in reality it has always been nearly as much so as now. Any party founded on a definite general principle or interest may in any age become international, and even what may seem unpatriotic. The Protestants of France in the 16th century sought help from England, and the Jacobites of England in the 18th sought help from France; just as the German socialists of 1870 sided with the French after Sedan, and the French communists of 1871 preferred to see their country occupied by the Germans rather than governed by the "Versaillais." In all these cases the party principles were naturally international, and the party bias overcame the patriotic.