noun, の adjective
You know how 警察 is "police"? Well, this is kind of like that. This time you have someone from the government trying to warn you about the bad things you do. This person, like 警察 is a police officer. It's kind of informal, so you might also say this means cop.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
That police officer's name was like a tongue twister.
The cop put me off with his vague answer.
"I broke up with Fugu last night." "What happened, Salmon?" "Well, he found out that I’m a cop and said he wouldn’t see me any more." "Just like that?" "Yeah. Just like that."