From July to October of 1943, Bleustein was imprisoned by the fascist government of the Spanish dictator Francisco Franco but was later released thanks to British intervention.

[4] He joined the Resistance, took the code-name "Blanchet", and was detached to serve as a co-pilot for the US Eighth Air Force, flying bombing missions over France and the Netherlands.

[1][5] When the war ended, he rebuilt Publicis from scratch, introducing the first opinion polls in France and developing the then-American fields of consumer research and brand analysis.

After the war, Bleustein-Blanchet reopened Publicis and, calling them on the phone himself, rapidly regained old and new clients, notably Shell, Colgate-Palmolive, L'Oreal, Renault, Dim and many others.

He was a founding member of L’Académie nationale des arts de la rue (ANAR) created in 1975 with Jacques Dauphin, Maurice Cazeneuve, Paul Delouvrier, Georges Elgozy, Roger Excoffon, Abraham Moles, and André Parinaud.