Allowed - not allowed

SunNews reports the following:
"American academic and former militant radical Bill Ayers won't be allowed to enter Canada, according to an association of university faculty who had asked him to speak at an upcoming conference. "
http://www.sunnewsnetwork.ca/sunnews/world/archives/2011/06/20110615-153627.html

As the media reports that Ayman al-Zawahri has emerged as the new leader of al Qaida, a CNN bio about him reveals how he was allowed into America in the 1990s.

"Ali Mohammed, a fellow Egyptian and Islamic Jihad member living in the United States, testified al-Zawahiri actually visited the United States twice on fund-raising trips in the early 1990s, including to a mosque in Santa Clara, California."
http://edition.cnn.com/CNN/Programs/people/shows/zawahiri/profile.html