Hi !
<em>What type of law would cover the landlord's right to force the man to move out of the building?</em>
Civil law
Squealer convinces the other animals to accept what Napoleon decides by stating that the healthier the pigs are the more intelligent and capable the animals would be of keeping humans away. Squealer has great oratory abilities and is able to appeal to the animals' fears.
So they would not be tempted to sin