Combined with massive influx of slaves from Gaul and other places making latin farm laborers too expensive. Still, the effect is the same. A large proletariat

Combined with massive influx of slaves from Gaul and other places making latin farm laborers too expensive. Still, the effect is the same. A large proletariat with very little income demanding to be fed by the state. With significant political power, based on making up a large percentage of the population in the capital.