Sylvain Bloch was 47 years old in 1942, when the Gestapo requisitioned the basement of the Strasbourg police station -- a building that had served as a prison since the Napoleonic era. The Gestapo needed the basement cells to hold the increasing numbers of prisoners being rounded up in the region. What they did not know -- what nobody outside a small circle of the French Resistance knew -- was that the man who delivered their bread every morning was a Jewish baker who had been using the bread delivery route as a cover for resistance activity for two years.
Bloch had operated a bakery in the Neustadt district of Strasbourg before the war, and his reputation for excellent bread had made him a fixture of the neighborhood. When the Gestapo took over the police station basement, they needed a bread supplier -- a mundane logistical requirement that Bloch's contacts in the Resistance saw as an extraordinary opportunity.
Over the course of months, Bloch developed a system. Each loaf of bread delivered to the Gestapo prison contained a coded message rolled into the dough. The messages were written on tissue paper -- tiny, folded into origami shapes known only to Bloch and his resistance contacts -- that were pressed into the dough during kneading. The bread was baked fresh, and the heat of the oven set the ink, making the messages nearly invisible until the dough cooled. Gestapo officers, eating the bread, had no idea they were consuming intelligence.
The information that Bloch smuggled out of the prison was extraordinarily valuable. It included the names of Gestapo agents -- including their cover identities, which were different from their real names --, the location of secret interrogation rooms, the shift schedules of guards, and most critically, advance warning of Gestapo raids on safe houses and resistance meetings. Bloch's network was responsible for saving an estimated 300 people from arrest over the course of his operation.
But Bloch also used his access to help prisoners in a different way. He developed a system of signals that allowed him to communicate with prisoners during his delivery rounds. A tap on the basement door, a specific arrangement of bread loaves on the delivery tray -- these were messages that informed prisoners whether a planned escape attempt would be supported or had been compromised.
The operation came to an end in January 1944. Bloch had been under surveillance for some time -- the Gestapo had grown suspicious of a baker who seemed to know too much about their schedules. He was arrested at his bakery by Gestapo officers who had been among his regular bread customers for two years. According to testimony from a prison guard who later joined the Resistance, Bloch was beaten severely during interrogation but revealed nothing. He was deported to Auschwitz in March 1944 and killed in the gas chamber upon arrival. He was 49 years old.
Sylvain Bloch's name was not publicly known until 2018, when a historian researching the Strasbourg Resistance for a memorial project discovered his name in documents in the archives of the Strasbourg Jewish community.