The underworld in a city is the organized crime there and the people who are involved in it.
a Spanish Harlem underworld of gangs, drugs, and violence.
一个拉帮结派、贩毒施暴的西班牙哈莱姆黑社会。
Some claim that she still has connections to the criminal underworld.
一些人声称她仍与罪恶的黑社会有联系。