Prohibition era disposal of illegal alcohol confiscated by the government. Alcohol played a major role in Fitzgerald's life; he was an alcoholic and likely died so young due to the effect his addiction had on his health.
There is not a fast car in the frame, but how can you doubt that they had one? Sisters Guarding Family Moonshine Business -- Florence Friermuth and Susie Friermuth Doffing pose after they were arrested for moonshining. The sisters guarded stills on their family's farm near Saint Paul, Minnesota, during Prohibition.
From 1920 to 1933 the United States had a prohibition on all alcohol. It was brought by the 18th Amendment. This is what started all the underground alcohol stills and all the big gang organizations that sold alcohol illegally.