Rosario Dawson, America Ferrera have signed on to Diego Luna's indie drama "Chavez," which stars Michael Peña as labor organizer Cesar E. Chavez. Dawson will play Dolores Huerta while Ferrera will play Chavez' wife Helen, [according to IMDB.]( The film which started shooting this week in Sonora, Mexico was written by Keir Pearson who's best known for writing "Hotel Rwanda." Luna, Gael Garcia Bernal and Pablo Cruz will produce through Canana Films along with John Malkovich, Lianne Halfon and Russell Smith, according to [Variety](