The primary characteristic of a feudal society is the exchange of land for services.
The overlord will grant the vassal a land in exchange for the vassal's services. Services like fighting beside the lord in terms of war. Vassals have their own men and since the vassal is at the service of the overlord, his men is also at the service of the overlord.
The America Legislator that assaulted a fellow Congressman prior to the start of the Civil War was Preston Smith Brooks, an supporter of slavery, who beat Senator Charle Sumner, an abolitionist, close to death at the United State Senate itself. For decades later Senators carried weapons, including revolvers into the Senate to protect themselves from assaults. Preventive measures proved unsufficient, since many more violent acts happenned over the years.
It demonstrated significant weaknesses in the Soviet economy.