What does it mean to be an "unindicted conspirator"?

Submitted by a word to the wise (Canada), Oct 28, 2008 at 10:11

My guess is that there was not enough evidence to put the person on trial.

That being the case, I hesitate to spread the word, since Mr. Pipes implies that these people indeed were conspirators, that he knows this to be the case, even though there was not enough evidence for a trial. How does he know?

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