Editor’s Note: Warning: This article contains descriptions of torture. Berlin CNN  —  Saman Yasin thought he was leaving prison. It was 5 a.m. and the guards had just told him to pack up his belongings. But the next thing he knew, he was blindfolded with a noose around his neck. “I was under that noose for about 15 minutes, I think,” the Iranian-Kurdish rapper told CNN in an exclusive interview, as he recounted being subjected to a mock execution – allegedly at the hands of the Iranian regime. “