Last fall, congress held hearings into the events of 9/11 in a joint session. Not only were they plagued by obstacles as the administration has a lot to loose if the truth gets out to a large number of people, but Bush and his cronies are also doing their best to reclassify and hide any and all materials related to the hearings. The Memory Hole, an excellent archiving website, has published transcripts and other materials related to the hearings on its website.
