The House Un-American Activities Committee (HUAC)
http://www.nara.gov/nara/legislative/house_guide/hgch25bw.html
http://www.moderntimes.com/palace/huac.htm
http://www.english.upenn.edu/~afilreis/50s/huac-main.html
http://www.songweaver.com/info/huac.html
http://radfilms.com/huac_study_guide.htm
http://www.stud.hum.ku.dk/rikkebj/huacintro.htm
http://www.moderntimes.com/palace/blacklist.htm