This is a story that has been pick up by Yahoo, Huffington Post, TMZ etc. Fritz Mueller was made the villain in the Jackie Robinson bio-pic "42". I understand that sometimes in movies liberties are taken to advance the story line. Nobody is arguing that Robinson wasn't targeted both by verbal assaults and pitched balls. Often historical movies utilize a composite character that represents several real-life people to get the point across. It would have been less painful to Fritz's family if they had done so in this case.
Here is a link to the article.