If you were to do just a little bit of research on Mr. Perle and check out his biographical information, you'll find that he served as Assistant Secretary of Defense in the Reagan administration from 1981 to 1987.
While it is true that his most recent post on the Defense Policy Board was not considered a "Department of Defense" position, this was really a case of finding a loophole in Department of Defense regulations specifically for him. As head of the DPB he was privy to a substantial amount of highly classified information and had an enormous influence on U.S. foreign policy under this administration.
If you really want to see how disgraceful this man's role in the Bush administration is, consider this: He was appointed to that "advisory" position specifically because he could not obtain the security clearances needed to serve as an official employee of the Department of Defense.
Source, please.
A cursory look suggests that you're either lying thru your teeth or simply echoing certain Arab media - even a site such as lewrockwell references Perle as having impeccable clearances. Not that they (or you) would necessarily know much detail of what clearances are given out, to anyone.
Sooo.... think you can give us a source?