Frank James MacArthur always said what was on his mind.
But sometimes, his sister told him, that wasn't the best idea.
"Frank is the kind of person who once in a while you wish he would lie because it wouldn't get him in trouble," Jean Arthur said. "Unfortunately for good or bad, he likes to give you his opinion."
"And when it comes to police officers," she added, "they don't like to hear your opinion."
MacArthur's confrontational, brash persona drew thousands to his Baltimore Spectator blog and Twitter page, where he railed against the city of Baltimore, police and the mainstream media. The same qualities exacerbated an...