Moonachie in particular isn’t far from the site (which like Moonachie, also borders on the Meadowlands).
Because of those acts, a small rail bridge in my town had a small troop of soldiers guarding it. The little stationhouse, unused but still standing when I was younger (1970s), is now gone but the foundation is still visible.
The US had a real dilemna in WWI; there were a lot of German-Americans (and Americans themselves) who didn’t want the US to fight in that war. In fact, one of the towns near Moonachie is “Carlstadt”, a recognition of the number of Germans in the area.
In both WW I and II, US internal security benefited from a wave of patriotic sentiment that bolstered the loyalties of German Americans. In addition, before WW II, the Roosevelt Administration had cracked down hard on the Bund and shut down various German spy rings before the war.
Even at that, the Germans had some notable early espionage successes in stealing plans for the Norden bomb sight and for the main US submarine torpedo. Like the British, the Germans were unimpressed by the Norden, and they detected and corrected the defects in the US torpedo firing mechanism that bedeviled US submariners during the first half of the war in the Pacific.