There was a movie in 1977 called Telephon starring Charles Bronson and Donald Pleasance.

While the underlying plot was a bit farfetched, the threat is real.  Russian saboteurs residing near US-based military facilities were living as American citizens for decades.  They were all hypnotized to carry out their assignments of sabotage when they answered a phone call with a phrase from a poem recited to them.  The hypnosis was a way to keep even the covert assets unaware of their purpose, thus ensuring they have almost no chance of ever being identified.

The real horror of the story was how vulnerable our bases were to attacks by nearby residents.  So, the concept of attacks within a small target area really isn't anything new.

https://www.imdb.com/title/tt0076804/


On a related note:

China Buying Land Near Sensitive
[Japanese] Military Sites: US Ally

Chinese buyers accounted for the largest proportion of foreign land and
property acquisitions near sites deemed sensitive to Japan's national
security during fiscal year 2023, according to a government survey
released Monday.

https://www.newsweek.com/china-buying-land-near-sensitive-military-sites-2006194


Map shows Chinese-owned farmland next to
19 US military bases in ‘alarming’ threat to
national security: experts

China has been buying up strategically placed farmland next to military
installations across the US, raising national security fears over potential
espionage or even sabotage.

The Post has identified 19 bases across the US from Florida to Hawaii
which are in close proximity to land bought up by Chinese entities and
could be exploited by spies working for the communist nation.

They include some of the military’s most strategically important bases:
Fort Liberty (formerly Fort Bragg) in Fayetteville, North Carolina; Fort
Cavazos (formerly Fort Hood) in Killeen, Texas; Marine Corps Base Camp
Pendleton in San Diego, California, and MacDill air force base in Tampa,
Florida.

https://nypost.com/2024/06/20/us-news/chinese-owned-farmland-next-to-19-us-military-bases/