Cuban ex-pat Julio Antonio Del Marmol gives an interview to the Epoch Times, about things he saw and did, starting as a teenaged military leader in Castro's regime, from the time of the revolution forward.
https://www.theepochtimes.com/former-cuban-military-leader-reveals-inside-story-on-castro-and-che-guevara_3798018.html?&utm_medium=Crossroads&utm_source=YouTube&utm_campaign=RegimeNature&utm_content=4-30-2021
Note: I just realized, it's possible this may be behind a paywall.