An indictment, or a legal document charging you with a crime, is something you don't want to be the recipient of, so try not to rob any banks or start any money laundering schemes, and you'll probably be okay.
An indictment is most frequently a charge of a serious crime. You may have heard on television legal programs the phrase "on the first count of the indictment," which means that there's more than one charge of a category of crime in the indictment. The word can also be used more informally to mean an accusation. A book or article detailing the wrongdoing of a person or industry may be said to be an indictment of that person or industry.