The term for a charge by a grand jury that a person committed a particular crime is an "indictment." An indictment formally accuses an individual of a felony and initiates the legal process against them. It is typically based on evidence presented by a prosecutor to the grand jury.
YES you can ! You are 'aiding and abetting' a KNOWN criminal. You would be treated as if you had also committed the crime.
A criminal.
Yes, a person can be prosecuted for a crime committed in another country if the crime is considered illegal in both the country where it was committed and the country where the person is being prosecuted. This is known as extraterritorial jurisdiction.
. . . . you need to have "probable cause to believe" that an offense is being committed, is about to be committed, or has been committed..
Yes a person can be charged with a crime
Extradition, or extraditing depends on if the person has been taken to the other state or not.
an accessory after the fact may be what you are looking for
The perpetrator of a crime is the person who actually committed the crime. A suspect may or may not have committed the crime. A suspect has not been confirmed as being the perpetrator.
Suspect.
a witness
The crime committed when someone threatens another person with a gun is typically considered assault with a deadly weapon.
If the person was still married to the first wife when the second marriage was performed then this is a crime (not a crime committed by the Judge unless the judge KNEW the person was already married - but a crime committed by the person who is still married). The second marriage is not legal (no matter who performed it) and the person who was still married has committed the crime of polygamy.