premise: Milk is a biographical film starring Sean Penn.
hypothesis: Milk is a 2008 American biographical film based on the life of gay rights activist and politician Harvey Milk , who was the first openly gay person to be elected to public office in California , as a member of the San Francisco Board of Supervisors . Directed by Gus Van Sant and written by Dustin Lance Black , the film stars Sean Penn as Milk and Josh Brolin as Dan White , a city supervisor who assassinated Milk and Mayor George Moscone .