Jerry

Form 1023 has to be filed every 3 or 4 years and it has the reasons the AMA qualifies for a 501 (c) 3.
Each year, on 4/15, a form 990 (or similar short form) has to be filed. The IRS demands that, upon request, copies be supplied to members of the organization. The AMA can, and probably does charge a miniumal fee for copies. Go to the IRS site and look at both of those forms. Nothing, but nothing, is hidden from the memberships of organizations.

Personally, I do not think that posting anyones income on the open internet is an acceptable way to do things. Fortunately for those that do, no one can stop them.