FBI Operation Ghost Stories arrested 11 people back in 2010. https://vault.fbi.gov/ghost-stories-russian-foreign-intellig...
What I'm wondering is: how many other agents are out there and haven't been caught yet? Or were here and left without being caught?
I wonder if this type of agent is still in active use, in the sense of seeding more of them. Given the arrests just 7 years ago, I'd guess so. But perhaps not, since hacking and electronic surveillance can be so effective. You don't necessarily need an agent within a country's borders to penetrate a lot of their networks, email, and other communications.
But you never know ... what lengths would Russia go to to get an agent TS/SCI clearance and access to a SCIF?