This is the 3215th most frequent Russian word.
незаконном
"Незаконном" means "illegal" or "unlawful" in English.
The word "незаконном" is used as an adjective (prepositional case, masculine singular) modifying "обороте," indicating that the drug trafficking is against the law.
Он был обвинён в незаконном обороте наркотиков.
He was accused of illegal drug trafficking.
Here, "незаконном" describes "строительстве" (prepositional case, neuter singular), implying the construction activities do not comply with legal regulations.
В этом городе часто говорят о незаконном строительстве.
People often talk about illegal construction in this city.
In this example, "незаконном" modifies "вырубке" (prepositional case, feminine singular), highlighting the unauthorized or prohibited tree felling in the forest.