Sapphire

Sapphire is a 1959 British crime drama film directed by Basil Dearden and starring Nigel Patrick, Yvonne Mitchell, Michael Craig, and Paul Massie. A progressive film for its time, it focuses on racism in London toward immigrants from the West Indies, and explores the "underlying insecurities and fears of ordinary people" about those of another race.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.