Adam Clarke on Exodus 5:6

The task-masters of the people and their officers - The task-masters were Egyptians, (see Clarke on Exo 1:11 (note)), the officers were Hebrews; see Clarke below Exo 5:14 (note). But it is probable that the task-masters Exo 1:11, who are called שרי מסים sarey missim, princes of the burdens or taxes, were different from those termed taskmasters here, as the words are different; נגשים nogesim signifies exactors or oppressors - persons who exacted from them an unreasonable proportion either of labor or money.

Officers - שטרים shoterim; those seem to have been an inferior sort of officers, who attended on superior officers or magistrates to execute their orders. They are supposed to have been something like our sheriffs.