Final answer:
The Ku Klux Klan (KKK) was a white supremacist organization founded in the 19th century. Atticus's comment about the KKK is a fictional quote, but the KKK has resurfaced multiple times in history.
Step-by-step explanation:
The Ku Klux Klan (KKK) was a white supremacist organization founded in the 19th century. It emerged after the Civil War in the South with the goal of reestablishing white supremacy. The KKK used intimidation, violence, and acts of terrorism against African Americans and their white supporters to achieve their objectives.
As for Atticus's comment, it is important to note that it is a fictional quote from the novel 'To Kill a Mockingbird.' While Atticus expresses optimism that the KKK will not return, it is essential to remember that the KKK has a long history and has resurfaced at various points in time, including in the 1920s and during the Civil Rights Movement.