They are referred to as the 'witness.'
The judgment is against the person, not the property.
The person a case is held against is the "Defendant". The person holding the case against them is known as the "Plaintiff".
a complaint against another person
A conflict with one's self is an internal conflict of a type known as person-against self as opposed to other types of conflict such as person-against-person or person-against nature.
Yes, it is against the law to hide an illegal person.
can you restrain a person against his will if you know it is for his own good?
Kidnap, abduct.
A person who speaks out against something is often referred to as a critic, dissenter, or opponent.
An antinuker is a person who is against the concept of making nuclear weapons.
Witness
It is not against the law to have one person working in a shop by themselves. If there is equipment that requires two people, then it is against the law.
It may not be against the law if a person removes it by accident. However, if a person removes it to try to cheat the person out of their property, it is very much against the law.