On the loss of the workers' party:

Food for thought today ... how Marx and Engels saw it in March 1850. Think to yourselves about how these principles apply today.

Brothers! (and sisters!)

In the two revolutionary years of 1848-49 the League proved itself in two ways. First, its members everywhere involved themselves energetically in the movement and stood in the front ranks of the only decisively revolutionary class, the proletariat, in the press, on the barricades and on the battlefields. The League further proved itself in that its understanding of the movement, as expressed in the circulars issued by the Congresses and the Central Committee of 1847 and in the Manifesto of the Communist Party, has been shown to be the only correct one, and the expectations expressed in these documents have been completely fulfilled. This previously only propagated by the League in secret, is now on everyone’s lips and is preached openly in the market place. At the same time, however, the formerly strong organization of the League has been considerably weakened. A large number of members who were directly involved in the movement thought that the time for secret societies was over and that public action alone was sufficient. The individual districts and communes allowed their connections with the Central Committee to weaken and gradually become dormant. So, while the democratic party, the party of the petty bourgeoisie, has become more and more organized in Germany, the workers’ party has lost its only firm foothold, remaining organized at best in individual localities for local purposes; within the general movement it has consequently come under the complete domination and leadership of the petty-bourgeois democrats. This situation cannot be allowed to continue; the independence of the workers must be restored. The Central Committee recognized this necessity and it therefore sent an emissary, Joseph Moll, to Germany in the winter of 1848-9 to reorganize the League. Moll’s mission, however, failed to produce any lasting effect, partly because the German workers at that time had not enough experience and partly because it was interrupted by the insurrection last May. Moll himself took up arms, joined the Baden-Palatinate army and fell on 29 June in the battle of the River Murg. The League lost in him one of the oldest, most active and most reliable members, who had been involved in all the Congresses and Central Committees and had earlier conducted a series of missions with great success. Since the defeat of the German and French revolutionary parties in July 1849, almost all the members of the Central Committee have reassembled in London: they have replenished their numbers with new revolutionary forces and set about reorganizing the League with renewed zeal.

This reorganization can only be achieved by an emissary, and the Central Committee considers it most important to dispatch the emissary at this very moment, when a new revolution is imminent, that is, when the workers’ party must go into battle with the maximum degree of organization, unity and independence, so that it is not exploited and taken in tow by the bourgeoisie as in 1848.

We told you already in 1848, brothers, that the German liberal bourgeoisie would soon come to power and would immediately turn its newly won power against the workers. You have seen how this forecast came true. It was indeed the bourgeoisie which took possession of the state authority in the wake of the March movement of 1848 and used this power to drive the workers, its allies in the struggle, back into their former oppressed position. Although the bourgeoisie could accomplish this only by entering into an alliance with the feudal party, which had been defeated in March, and eventually even had to surrender power once more to this feudal absolutist party, it has nevertheless secured favourable conditions for itself. In view of the government’s financial difficulties, these conditions would ensure that power would in the long run fall into its hands again and that all its interests would be secured, if it were possible for the revolutionary movement to assume from now on a so-called peaceful course of development. In order to guarantee its power the bourgeoisie would not even need to arouse hatred by taking violent measures against the people, as all of these violent measures have already been carried out by the feudal counter-revolution. But events will not take this peaceful course. On the contrary, the revolution which will accelerate the course of events, is imminent, whether it is initiated by an independent rising of the French proletariat or by an invasion of the revolutionary Babel by the Holy Alliance ...

Much more here: https://www.marxists.org/archive/marx/works/1847/communist-league/1850-ad1.htm