Here's some context from a Politico story on why the French comedian is so controversial:
In one routine, Dieudonné said that when he thought of a particular Jewish journalist, the gas chamber came to mind.
In the Facebook post that led to his arrest, he responded to the "Je suis Charlie" movement by saying he was like Amedy Coulibaly, one of the alleged gunmen in another attack in France.
This isn't McKinney's first foray into this realm. After becoming a top target of the pro-Israel lobby for opposing aid to the Jewish nation, she accused her opponents of antisemitism. Her father, then-state Rep. Billy McKinney, said of her 2002 primary fight that "Jews have bought everybody."