As I recall from back then, he didn't actually support everything his brother, The President, did and was much more liberal than JFK.
I haven't heard much about that. I did read that while he was Attorney General, he pressed forward on investigations into the Mafia while almost certainly knowing that his brother John was sleeping with a Mafia princess. I commend him for doing the right thing in that case.
I'll give a politician credit for basic moral decency, even if I disagree with much of his politics. For that reason, I didn't trash Bobby Kennedy in my original post on this thread. But as others have pointed out, the movie will probably elevate him to Godlike status, and thus be most unpleasant to watch.