I'm writing on propaganda preparation of the Iraq war by the INC/NeoCon complex.

I need to know exactly which law forbids US' foreign intelligence services to conduct domestic propaganda (now and in the 90s). Can you help me?

This is the context for my question:

"From an office near Victoria Station, the Rendon Group set out to influence global political opinion against Saddam. Given Saddam’s record of atrocities against his own people, it wasn’t a hard sell. “It was a campaign environment, with a lot of young people, and no set hierarchy,‿ Brooke recalled. “It was great. We had a real competitive advantage. We knew something about the twenty-four-hour media cycle, and how to manage a media campaign. CNN was new at that point. No one else knew how to do these things, but Rendon was great at issue campaigns.‿ The group began offering information to British journalists, and many articles subsequently appeared in the London press. Occasionally, he said, the company would be reprimanded by project managers in Washington when too many of those stories were picked up by the American press, thereby transgressing laws that prohibited domestic propaganda. But, for the most part, Brooke said, “It was amazing how well it worked. It was like magic.‿" (http://www.newyorker.com/fact/content/?040607fa_fact1)

Since 9/11 the INC doesn't neccessarily take the long way around foreign countries. (http://www.commondreams.org/headlines04/0316-02.htm) Why not? (The New Yorker author writes "transgressing laws that prohibit_ed_ domestic propaganda".) Are services now allowed to conduct domestic propaganda as an effect of 9/11?

Thank you very much and best regards