Emblem of the Ku Klux Klan – A cross in a circle with the 'blood drop' in the center; sometimes turned by 45°. The emblem is known as the 'Mystic Insignia of a Klansman' or the 'Blood Drop Cross'.

In use since at least the 1960s. (1966 reference, 1979 reference)
KKK-symbol.jpg vectorized using Inkscape
Original: KAMiKAZOW Vector:  Estoves