Dealing with People who are bad Influences

 Devarim (28:9-10)You stand this day, all of you, before your God יהוה —your tribal heads, your elders, and your officials, every householder in Israel, your children, your wives, even the stranger within your camp, from woodchopper to waterdrawer—

Rashi (Devarim 29:10) FROM THE WOODCUTTER [UNTO THE DRAWER OF THE WATER] — This teaches that some of the Canaanites came in Moses' days to become proselytes just as the Gibeonites came in the days of Joshua, — and this is the meaning of what is stated of the Gibeonites, (Joshua 9:4) “And they also acted cunningly”; — and Moses made them woodcutters and drawers of water (cf. Midrash Tanchuma, Nitzavim 2).

Rashi says the woodchoppers and waterdrawers are the lowest in society. He says they are Cananites who decided to convert rather than be killed. Since they were an undesirable influence they were given the most menial tasks so that they should be avoided and not influence others. I saw in the Sefer Mishna Torah that they in fact were assigned to work in the Temple. He asks but this would seem as a reward for their trickery? He answers there are two ways of dealing with bad people 1) ostracize or isolate them 2) Expose them to good influences so they become good also. The Temple was the place of optimal good and thus they might become better.