Gabelle n. : A tax, especially on salt.

Example:
What happens to Gabelle in A Tale of Two Cities?

Taxonomy
gabelle, salt, tax, free encyclopedia, price, provinces, faux-sauniers, death, abolished, salt marshes, A Tale of Two Cities, gabelles, minot, weapons, Atlantic Ocean, Commodity, Salt Satyagraha, provinces in France.

Defination from the web:
Gabelle was originally applied to taxes on all commodities, but was gradually limited to the tax on salt. ... In turn, the customs guards tasked with arresting the faux-sauniers were nicknamed gabelous, a term obviously derived from the gabelle they sought to uphold. ...