What Happens When the Working Class Doesn't Act?

The ultimate problem, i think, that that socialist partis faced in parliamentary democracies and end throughout the history of modernity. What happens if the working class doesn't do what some markists, and marks himself perhaps, thought they would do? And so i think from that question, we agai then got into questions of like the literal mechanisms of party leadership ad in whose a who's acting on behalf of the workers? How are they acting on their bourgeois effication to inform strategic decisions made during these german revolutions?