Sentence:  So it is too with many other spirits which we all know : the spirit of Nazism or Communism , school spirit , the spirit of a street corner gang or a football team , the spirit of Rotary or the <WSD>Ku</WSD> Klux Klan . 
Meaning of the word marked with <WSD> tags:  a secret society of white Southerners in the United States; was formed in the 19th century to resist the emancipation of slaves; used terrorist tactics to suppress Black people