The Departments of State and Justice are usually reluctant to release the evidence they believe justifies their claims. particularly when disclosure of that evidence might compromise sensitive intelligence sources and methods. And this is a legitimate concern. But in the absence of prior review outside the executive branch for visa denials. and with the reluctance of that branch to admit that U.S. citizens have the right to challenge such visa denials after the fact. abuses have occurred. Some visa denials made on the basis of alleged threats to security have been downright ludicrous. Parley Mowat. Canadian naturalist and author of "Never Cry Wolf". was denied entry into the United States on April 23. 1985.