At the same time, there are legit cases where foreign nationals/states were interfering into those events (eg BLM movement was amplified by Russia) in the hopes

At the same time, there are legit cases where foreign nationals/states were interfering into those events (eg BLM movement was amplified by Russia) in the hopes to destabilize US. Unless there’s enough metadata to identify specific foreign actors, how can FBI fight that? And I am sure there are spies/agents who became naturalized US citizens - how to detect those??…