Because slavery was central to their economy.
It would be the "Ku Klux Klan" that is considered to be a domestic terrorist group, since they have a long history of intimidating people (especially blacks and Jews) with whom they disagree and degrade.
The freedom ride took place in 1961. though the freedom ride is well-known in civil rights history, it was not the first time that segregation in transport had been challenged in the deep south. in 1946, the supreme court ruled that segregated seating on interstate buses was unconstitutional.
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They were called Roundheads