Some film directors, producers and actors who have produced highly-esteemed bodies of work are now facing a critical re-appraisal, due to recent allegations of harassment and sexual assault. Is the behavior of artists inseparable from their art? Tracy Smith talks with Tippi Hedren, who says she was harassed by director Alfred Hitchcock on the set of “The Birds,” and with actresses Uzo Aduba and Amber Tamblyn, who are founding members of Time’s Up.