People watch Glengarry Glen Ross for one scene in particular, and it occurs near the beginning of the movie. Alec Baldwin's character is from downtown, from Mitch and Murray, and he's there to whip a room of downtrodden salesman into shape. Either they close deals, or they're fired.
Glengarry Glen Ross, based on a play, is much more than one classic scene in cinema. It is desperation. The characters have long abandoned the honest approach to selling real estate. Dishonesty has failed them too. No one is buying. The choices are stark.