Passage: Thus, the MSPD was able to establish a firm base on the local level. But while the councils believed they were acting in the interest of the new order, the party leaders of the MSPD regarded them as disturbing elements for a peaceful changeover of power that they imagined already to have taken place. Along with the middle-class parties, they demanded speedy elections for a national assembly that would make the final decision on the constitution of the new state. This soon brought the MSPD into opposition with many of the revolutionaries. It was especially the USPD that took over their demands, one of which was to delay elections as long as possible to try to achieve a fait accompli that met the expectations of a large part of the workforce.

Question: Who considered the councils actions to be disturbing?
party leaders of the MSPD