Was the Ku Klux Klan of the an Extremist Movement?

Was the Ku Klux Klan of the 1920's an Extremist Movement?
<Tab/>The Klan of the 1920's, founded by William J. Simmons, for five years, only consisted of 4,000 to 5,000 members. On June 7, 1920, Simmons signed a contract with two intelligent salespersons. Edward Clark and Elizabeth Tayler. The Klan campaign yielded an immediate success. Total membership figures too difficult to state, ranked somewhere between three and five million people. Did the Klan show signs of an extremist movement? Hate towards immigrants, Jews, and Catholics lead people to believe so.
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