Jessie Jordan (23 December 1887 – 1954) was a Scottish hairdresser who was found guilty of spying for the German Abwehr (military intelligence) on the eve of World War II.

[3] The implementation of the Nazis' New Order caused another contributing factor to Jordan's move back to Scotland: when her daughter Marga attempted to return to her acting career she was required by German authorities to provide proof of an "Aryan" descent on her mother's side.

[3] In July 1937, Jordan told the Glasgow Police Alien Registration Department that she was returning to Scotland to reconnect with her family and to find proof of Marga's Aryan descent.

[3] Reporting on her trial, The Dundee Courier speculated that "it does not appear that Mrs Jordan took to spying because of love of Germany or hatred of Britain, or even from a desire to make money from it.

[3] In addition, Jordan was found to possess maps of Scotland and Northern England marked with the location of key military sites.

[3] Jordan's activities were exposed when Mary Curran, a cleaner employed at the salon, found maps in the shop; she and her husband reported her findings to the Dundee police and, eventually, MI5.

As a result of Curran's report, the address of the salon on Kinloch Street was added to an ongoing mail watch, after which point incriminating post from the United States was discovered.

Her incarceration had a serious impact on her daughter's life as well; despite a second marriage to Glaswegian Tom Reid, Marga struggled financially and died in January 1939 as a result of what her husband called an "illegal operation".

Due to mistakes of FBI criminal investigator Leon G. Turrou most of the ring managed to flee, but the 1938 trial of the rest still turned the American public significantly against Nazi Germany.

It is postulated that American anti-Nazi feeling fed into the Japanese decision to bomb Pearl Harbor and for Germany to swiftly enter the war as Japan's ally.