The Members of the third estate in the Estates General. These members tended to be from the upper middle class, or bourgeois, and were often referred to as "Jacobins" since they frequently met in Jacobin clubs to discuss the revolution.
The lower third estate, or the rest of the citizenry, led the fighting arm of the revolution and the National Assembly at this time. They didn't however, take part in the government.
The Urban middle class led the storming on the Bastille and the march on Versailles.