spy ring

Translations
шпионское кольцо
The authorities dismantled a spy ring that had been active for years.
Власти разоблачили шпионское кольцо, которое действовало в течение многих лет.
Definitions
A spy ring is a group of individuals who collaborate to gather and share secret information, typically related to national security or military intelligence, often operating covertly and engaging in espionage activities.