I'm pretty sure that the answer is 'the Romans"
Although historians often speak of a “Populist movement” in the 1880s, it wasn't until 1892 that the People's or Populist Party was formally organized. The Omaha Platform, adopted by the founding convention of the party on July 4, 1892, set out the basic tenets of the Populist movement.
Recall, it's the procedure that allows citizens to remove and replace a public official before the end of a term of office.
