Chelsea Manning faces contempt hearing after refusing to testify before grand jury

[GemDigger]

13. This might answer your questions.

https://criminal.findlaw.com/criminal-procedure/how-does-a-grand-jury-work.html

Grand Jury Proceedings
How a grand jury works is much more relaxed than normal court room proceedings. There is no judge present and frequently there are no lawyers except for the prosecutor. The prosecutor will explain the law to the jury and work with them to gather evidence and hear testimony. Under normal courtroom rules of evidence, exhibits and other testimony must adhere to strict rules before admission. However, a grand jury has broad power to see and hear almost anything they would like.
However, unlike the vast majority of trials, grand jury proceedings are kept in strict confidence. This serves two purposes:
It encourages witnesses to speak freely and without fear of retaliation.
It protects the potential defendant's reputation in case the jury does not decide to indict.