underbelly

The other side of the detective’s profile has him strolling between the starched propriety of upper-class society and the sooty underbelly, doing rich men’s dirty work.

His unit works with police forces across the country to improve training and coordinate responses, which he said is finally "lifting the lid on the criminal underbelly of hare coursing".

Testimony delivered at the ongoing trial of three accused Aryan Brotherhood members delved into Los Angeles County’s underbelly: Cheap hotels, gambling parlors and crash pads from Lancaster to Long Beach, drug dealers and fraudsters.

When discussing Lynch’s films, people often refer to his propensity for exposing society’s underbelly.

His policies and personality turned over America’s wretched underbelly, allowing it to breathe and strengthen itself.