The proceedings of the South Carolina Klan Trials can be found here:
https://babel.hathitrust.org/cgi/pt?id=loc.ark:/13960/t7xk8kw15&view=1up&seq=1
p. 478 is Foster testimony about assassinations
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Excellent research!
Thank you for bringing to light this primary source.
Admin-
Can I make a suggestion?
Do you have any material to post about William Mahone and the Readjuster Party of Virginia?