A sealed indictment is a type of formal criminal charge that remains hidden from both the public and the defendant until a judge orders it unsealed. This secrecy helps law enforcement protect witnesses, prevent the destruction of evidence, and reduce the risk of the accused fleeing before arrest. Keeping an indictment sealed also prevents potential public danger, since suspects might otherwise attempt to interfere with investigations or intimidate victims.
A sealed indictment is also sometimes called a secret indictment because it is kept confidential until the right moment.
By contrast, a criminal complaint is different from an indictment. A complaint is typically filed directly by a prosecutor or law enforcement officer before a magistrate judge. It outlines the alleged criminal conduct and allows the case to move forward temporarily. Unlike an indictment, which requires the decision of a grand jury, a criminal complaint does not carry the same constitutional weight. Often, prosecutors will use a complaint to start a case quickly and then later present the evidence to a grand jury for an indictment. Both an indictment and a criminal complaint are considered a formal charging document, though they arise in different ways.
In short:
Sealed indictment = formal charges approved by a grand jury, but kept secret until unsealed.
Criminal complaint = an initial charging document filed by prosecutors to begin proceedings, sometimes later replaced by an indictment.