The aspect of the communist approach that was responsible for Mao's victory is using the "Guerrilla's Tactics" and these tactics are the following:
1. They will retreat when the enemy advances.
2. They harass when enemy encamps.
3. They will attack every time the enemy is hesitating.
4. They will pursue when the enemy is retreating.
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 Taking of Property for Public Use. Eminent domain is the power of government to take private land for public use. This power is limited by the federal Constitution and by state constitutions -- when the government does take private property for public use, it must fairly compensate the owner for the deprivation. So no they can unless they have the owners permission :)