Brought up in a family of socialists, she trained in photography at Walter Gropius's Bauhaus in Dessau, and carried her political ideals through her art.

Through her connections with Arnold Deutsch, Tudor-Hart was instrumental in the recruiting of the Cambridge Spy ring which damaged British intelligence from World War II until the security services discovered all their identities by the mid-1960s.

She recommended Litzi Friedmann and Kim Philby for recruitment by the KGB[3] and acted as an intermediary for Anthony Blunt and Bob Stewart when the rezidentura at the Soviet Embassy in London suspended its operations in February 1940.

[11] Following her marriage, she moved to South Wales where her husband practised as a GP in the area of Rhondda Valley,[12] she began to produce photographs for The Listener, Arbeiter-Illustrierte-Zeitung, Der Kuckuck,[13] The Social Scene and Design Today, dealing with issues such as refugees from the Spanish Civil War and industrial decline in the north-east of England.

[citation needed] Tudor-Hart was instrumental in recruiting members of the Cambridge Spy ring, which damaged British intelligence from World War II through to its discovery in the late 1960s.

Tudor-Hart had spotted him as a potential Communist agent during his stay in Vienna, where he was a sympathiser of the Social Democrats who waged a civil war against the government of Engelbert Dollfuss.

According to her report on Philby's file, through her own contacts with the Austrian underground Tudor Hart ran a swift check for the NKVD and, when this proved positive introduced him to "Otto" (Deutsch's code name).