In this episode the team discuss multiple acts of sabotage on U.S. soil during WW I.
Sources for this episode -
https://www.worldwar1centennial.org/index.php/communicate/press-media/wwi-centennial-news/1295-black-tom-island-germany-secretly-attacks-u-s-during-wwi.html
https://www.atlasobscura.com/places/the-black-tom-explosion-memorial-jersey-city-new-jersey
https://en.wikipedia.org/wiki/Mare_Island_Naval_Shipyard
https://www.army.mil/article/182075/february_1918_wwi_counterintelligence_agents_get_their_man
"The Detonators: The Secret Plot to Destroy America and an Epic Hunt for Justice — Central Intelligence Agency". www.cia.gov.
https://www.pbs.org/opb/historydetectives/feature/wartime-acts-of-sabotage/
http://jurist.law.pitt.edu/paperchase/2004/08/august-16-this-day-at-law-first-german.htm
https://military.wikia.org/wiki/Lothar_Witzke
https://nj1015.com/a-look-back-at-the-1917-kingsland-lyndhurst-explosion/