It is a codename that identifies them to one another as revolutionists.
Parisian revolutionaries first began speaking to each other as Jacques during the Jacquerie, the peasant uprising of 1358 against the French nobility. The aristocrats derogatorily called the peasant by the very common name Jack in order to emphasize the peasant's inferiority complex and deny him individuality.
The more people see Dr. Manette, the more people know about the French peasants so that more people can know what the French government is doing to those in captivity. You can see the horrible treatment. Jack One Two Three, and Four members of Jack Lee were the revolutionaries who organized and carried out the French Revolution. His name comes from a farmer's nickname. They use the name Jack as a colloquial name for members of the Revolution.
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