Men and women are not treated like equals in the workplace and this is well known, even in Hollywood. However, some women are trying to change the status quo by standing up for themselves and demanding equal pay, and Rossum is one of these people.
Rossum made headlines in 2017 for her salary negotiations with Showtime for her role as Fiona Gallagher on Shameless. Despite being one of the main characters in the series, she was earning less than her male costar, William H. Macy — who supported her decision to negotiate her contract.
Rossum discussed this during a live event at the Vulture Festival (via Indiewire). She said, "When the show started, Bill [Macy] was the first person attached… I was the last piece of the puzzle and I'd never done TV before, I wasn't as well known, and Bill [Macy] is obviously an Oscar nominee." However, as time went on she became a bigger part of the show, and she felt that the leadership role between herself and Macy was "somewhat shared," which is why she decided to do something about it.