Among the Hidden
Starting with General Sherwood who created the Population Law, the Government has been oppressing people right and left: suppressing non-Barons into poverty, giving special treatment to those with money, and basically being all around evil.
The Population Police are a special breed of bad news. Word on the street is that "they'd do anything to enforce the law" (2.34). We picture some sort of mix between Dog the Bounty Hunter and Nazi, with the only silver lining being that they accept bribes, which is how Mr. Talbot gets them to leave when Luke is hiding in the closet.