Answer: kkk

AnswerCrossword Clue
KKKInitials on a sheet
KKK11th letter, three times
KKKWho took the Ramones' "Baby Away"
KKKHateful org.
KKKHate grp.
KKKHoods in hoods: Abbr.
KKKOrg. founded in 1915
KKKWhite-supremacy org.
KKK"...-Katy," 1918 song
KKK"..-Katy"
KKKFearsome initials.
KKKTerrorist group.
KKKInitials dating from 1865.
KKKErstwhile "Empire."
KKKStart of a stuttering song.
KKKHooded organization.
KKK"The Birth of a Nation" grp.
KKK"..-Katy" (1918 song)