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I threw myself into the teachings of Keith Raniere with everything I had.

I devoted my loyalty, my resources, and, ultimately, my life to him.
This was the biggest mistake and greatest regret of my life, Macks letter reads.
I am sorry to those of you that I brought into Nxivm.
I am sorry I ever exposed you to the nefarious and emotionally abusive schemes of a twisted man.
Mack is due for sentencing in a Brooklyn federal court on June 30.