No problem. Here’s a great article by historicaly that goes into some of the conditions of feudal Tibet for example, before the communists liberated it ( the conditions were similar for all rural China too before the revolution ):

In the 1940s, only 200 families owned 95% of all land in Tibet, and 95% of its people were illiterate. Child labor was rampant, and malnutrition was common. The average life expectancy for serfs in Tibet was 36 years. When the serfs were “taxed,” they had to provide various forms of forced labor. Some serfs owed all their daytime labor to the lords, others owed five days a week of unpaid labor, and some were at the disposal of the lord’s every whim.

I can’t imagine a class like owners coming to the streets and reclaiming their unjust properties by themselves, so wouldn’t that render them powerless and not a threat anymore?

Its a common pattern for the propertied classes to hire mercenary armies, or recruit from the petit-bourgeoisie, or just entice poorer people with promises of some of their wealth. This is the case in all revolutionary events, a civil war of the propertied classes against the propertyless always follows: russian, chinese, cuban, vietnamese, korean, french rev, etc.