He claims that there has been a gag order placed on John Shaw, the operator who actually took Felt's call, and on Glenn Cramer, the supervisor.
More interesting is the gag order on Sibel Edmonds. Is that made up by terrorcell too?
Gentlemen, looking at your questions from a legal perspective, what's being said about "gag orders' seems extremely unlikely.
A gag order is just that - an Order. The only body in government that can issue an Order is a Court. A gag order occurs when a judge in an ongoing case orders the parties not to discuss the matter in public. Really the only reason is that the judge thinks such a discussion will prejudice a jury or otherwise interfere with the Court's ability to hear the matter fairly.
So, when you claim there are gag orders on certain individuals, my first question is: In what ongoing case? I know of no case in any court in any jurisdiction in any country involving these people. Find the case and you can find the Order. It will be a matter of public record (and probably hotly contested by news organizations).
There are certain exceptions. A non-disclosure clause could be confused with a gag order. In that case, a person has willingly contracted to not disclose something for some amount of money or other consideration. To my knowledge, no government agency in any jurisdiction in America buys silence from non-employees with a non-disclosure agreement. It's pretty much the opposite of how our justice system works.
In certain cases, CIA employees (and others in inteligence) can be stopped from revealing certain secrets, but none of the people you named were CIA employees who learned their secrets in the course of their CIA employment.
I know of no case in history where a private citizen who happened to come across sensitive information was stopped by the government from revealing it. In fact, the very famous Pentagon Papers
WP case involved government attempts to stop the New York Times from publishing 7,000 pages of secret documents on the Vietnam War. The Supreme Court ruled that the government could go jump in a lake (using, I believe, those exact words).
Understanding how the system works, I find it unlikely bordering on impossible for the allegations of "gag orders" to be true.
Edit: Darn it all to heck, what's the Wikipedia tag?