What is a documentary (or presenter e.g. Michael Moore) that is known for its bias? What is a documentary (or presenter e.g. Michael Moore) that is...

I would
offer you to take your pick.  Moore has been divergent to an extent in his film-making.  His
early films such as "Roger and Me" and "The Big One" took major and direct
aim at unfair business practices and struck a very populist chord in its assertion that wealthy
industrialists are only that because of the economic brutality perpetrated upon their workers. 
His work took a more decidedly political, anti- Republican stand with "Bowling
for...