Русско-англо-русский юридический словарь

The term outlawry referred to the formal procedure of declaring someone an outlaw, i.e. putting him outside the sphere of legal protection.[1] In the common law of England, a judgment of (criminal) outlawry was one of the harshest penalties in the legal system, since the outlaw could not use the legal system for protection, e.g. from mob justice. To be declared an outlaw was to suffer a form of civil or social[6] death. The outlaw was debarred from all civilized society. No one was allowed to give him food, shelter, or any other sort of support – to do so was to commit the crime of aiding and abetting, and to be in danger of the ban oneself. (Wikipedia)

“There’s accomplice liability law,” Weisberg said. “Even if we didn’t have a conspiracy law, if you are engaged in an act with a certain mental state which would make you guilty of a crime and if I aid and abet you — and sometimes aiding and abetting can be really a form of really active encouragement, no more than that — I am an accomplice to the crime, and an accomplice to a crime commits the crime.”

“There isn’t any separate crime called ‘complicity’,” he continued. “It’s just a way of committing a crime.” (The Washington Post)

For example, if a boy walks up to his schoolmate on the street and asks him to shoplift a toy for him, this is solicitation, even if the schoolmate never acknowledges the boy's request, enters the store, or completes the crime. In fact, should the solicited individual, such as the schoolmate, actually complete the crime, the defendant may be liable not only for solicitation, but also for aiding and abetting the crime as an accessory before the fact. (Justia)

Aiding means helping someone to commit a crime while abetting means encouraging or counseling someone to commit a crime. [...] Abetting means that you have done something that encourages or supports the commission of a crime. That support can be active, in the form of instigation, or passive, just being there when plans are made. (The Law Offices of Bryan R. Kazarian)