what do flavius and marcellus want the commoners to do?

Two Roman tribunes, Flavius and Murellus, see the common people parading in the streets instead of working in their shops. They demand to know why the men are not working. A cobbler informs them that the people are celebrating Caesar's victory. Murellus is infuriated by this information, and calls the workers, "you blocks, you stones" (1.1.34). He then tells them that Caesar has not defeated an enemy, but rather that Ceasar has killed the sons of Pompey the Great. Pompey previously ruled Rome along with Caesar until their alliance fell apart, at which point they went to battle over the right to rule.

Flavius's speech then causes the commoners to be ashamed of celebrating Caesar's victory. They depart in a more sober mood.