The cat "Holocaust denial" is "For articles on people who engage in Holocaust denial". There is no doubt about Faurisson being a Holocaust denier, but I still do not think Dieudonne deserves to be in this category, as he is not for sure a Holocaust denier himself.ref: http://www.in.com/videos/watchvideo-du-grand-art-dieudonne-sur-telesud-17-juin-2010-12-8302420.html
It seems to me that this category should be reserved for convicted Holocaust deniers.