Editing J. Edgar Hoover (section)

====Florida and Long Island U-boat landings====
{{main|Operation Pastorius}}
The FBI investigated rings of German saboteurs and spies starting in the late 1930s and had primary responsibility for counterespionage. The first arrests of German agents were made in 1938 and continued throughout World War II.<ref>
{{cite book|author= [[William Breuer|Breuer, William]]
|title= Hitler's Undercover War
|location= Florida & New York
|publisher= St. Martin's Press
|date= 1989
|isbn= 978-0-312-02620-2
|url= https://archive.org/details/hitlersundercove00breu
}}
</ref> In the [[Ex parte Quirin|Quirin]] affair during World War II, German [[U-boat]]s set two small groups of Nazi agents ashore in Florida and on [[Long Island]] to cause acts of [[sabotage]] within the country. The two teams were apprehended after one of the agents contacted the FBI and told them everything – he was also charged and convicted.<ref>
{{cite journal
|last= Ardman
|first= Harvey
|title= German Saboteurs Invade America in 1942
|journal= World War II Magazine
|date= February 1997
|url= https://www.historynet.com/world-war-ii-german-saboteurs-invade-america-in-1942.htm}}
</ref>