the summer of 2017, the FBI made a pair of arrests that fundamentally changed the U.S. intelligence community’s view of Hezbollah
Ali Kourani, an undercover Hezbollah scout as a student in the U.S.. told FBI agents the assassination of Nasrallah would trigger a terror attack here.
https://open.substack.com/pub/spytalk/p/hezbollah-had-a-us-terror-plan-if
the group has conducted fundraising operations in the country and would likely want to position so-called "sleeper agents" as part of its efforts to develop operational capabilities in the country.
Ali Kourani and Samer el Debek were arrested in June(2017), and charged with providing material support to Hezbollah's Islamic Jihad Organization.
According to the criminal complaint against him, Kourani described his role with IJO as a "sleeper."