I'm looking for a source but not finding one.
[He did but his primary target were really carpetbaggers from the north. If the blacks supported them, they too were targeted.]
The evidence provided indicates nothing about carpetbaggers as you claimed but about voting.
[stated that the Khan disappeared by the time the Reconstruction period ended.]
Where exactly did it say that?  Because the way I read it, it started in Tennessee in 1866 and quickly spread beyond it.  Forrest may have tried to end it when he quit a year after he was elected but the article indicates that Forrest didn't speak for any chapters outside Tennessee (Forrest claimed that the Klan had 40,000 members in Tennessee and 550,000 total members throughout the Southern states) but he didn't have any formal ties with them, ie. his orders have no effect on them.
Do you not have a source?  Am I supposed to just take your word for it?