I don't know much about Bannon other than he is an extreme troll, agitator, rabble-rouser, and propagandist. Is he a racist white supremist? Maybe, but according to people who worked for and know him, he's more of a anarchist who strategically courts these scum/white supremists to agitate them and profit off their anger, similar to how Trump ran his campaign. I think the following best describes the new Chief Strategist of the white house (according to an article from thedailybeast)

Then we had a long talk about his approach to politics. He never called himself a “populist” or an “American nationalist,” as so many think of him today. “I’m a Leninist,” Bannon proudly proclaimed. Shocked, I asked him what he meant.

“Lenin,” he answered, “wanted to destroy the state, and that’s my goal too. I want to bring everything crashing down, and destroy all of today’s establishment.” Bannon was employing Lenin’s strategy for Tea Party populist goals. He included in that group the Republican and Democratic Parties, as well as the traditional conservative press.

His goal was to bring down the entire establishment including the leaders of the Republican Party in Congress.