Yes.
Yes, it is illegal for someone to gamble on behalf of another person without proper authorization or consent. This is considered illegal gambling and can result in legal consequences.
When someone encourages or helps another person to commit an illegal act or crime, it is called "aiding and abetting." And, yes, you can be prosecuted for it.
Murder for hire is the act of paying someone else to kill a person or persons or accepting remuneration for killing someone for another person.
It is not illegal for someone to threaten to sue another person, as long as the threat is not accompanied by false statements or intended to harass or intimidate. However, if the threat is carried out and a lawsuit is filed, the court will determine the legality and validity of the claim.
If you use reasonable force you are often protected.
No, it is illegal to purchase alcohol for someone else, especially if they are underage.
One person paying half and another person paying half.
One person paying half and another person paying half.
Actually, yes. It is illegal to make a fake Facebook of someone your not. You can get charged loads of money and could go to jail, for personating another person.
In order to remove someone from your apartment, you will need to obtain an eviction notice. Without an eviction notice, it is illegal to remove the person from the premises.
Downloading illegal music is, obviously, illegal. It is therefore up to the individual person's conscience whether they undertake this procedure. It is usually done purely to avoid paying the market price for music and thus a money-saving exercise.
Hiring someone to beat up another person is commonly referred to as assault or hiring a hitman. It is illegal and punishable by law.