Best ensemble noirs.
That is to say which noirs have the best/biggest collection of noir actors? Something that gives The Strange Love of Martha Ivers some competition.
Secondary challenge. Represent as many noir greats as you can with only 5 films.
Scarlet Street/East Side West Side/Pitfall/Crossfire/Casablanca - Stanwyck, Mason, Heflin, Garner, Powell, Scott, Wyatt, Burr, Robinson, Duryea, Bennett, Ryan, Mitchum, Grahame, Bogart, Bergman, Rains, Lorre, Henreid, Greenstreet.