On June 18, 1964, Black and white protestors jumped into the whites-only pool at the Monson Motor Lodge in St. Augustine, Florida In an attempt to force them out, hotel owner James Brock dumped acid into the water.
This famous photograph by Horace Cort shows a group of white and black integrationists in the former Monson Motor Lodge swimming pool on June 18, 1964.
The photo was connected to the St. Augustine Movement, named for the town in Florida where it took place.
Lots of peaceful protests and demonstrations were responded to with violence, which led to more and more complicated protests.