From Bob Dearborn's The Olde Disc Jockey's Almanac this morning...
"August 15, 1966…The Beatles played D.C. Stadium in Washington for more than 32,000 fans who paid $3 each for tickets. Five members of the Ku Klux Klan, led by Maryland's Imperial Wizard, picketed the concert."
It's hard to imagine that the Klan was still an acceptable part of southern society as recently as 45 years ago. This video is kind of chilling in retrospect...