단속이 · 단속을
crackdown, enforcement, control
Example
오늘 밤 이 도로에서 음주 운전 단속이 있어요.
There is a drunk-driving checkpoint on this road tonight.
Word parts
단 gather+속 bind
Literally 'gather and bind'—keeping things tightly under control.
Good to know
단속에 걸리다 'to get caught in a crackdown' is very common.