In this multi-part episode, we'll see more in-depth about the early years of the colonisation of Congo free state by king Leopold II of Belgium. This episode might contain stories and situations that are not for the faint of heart. 

Big thanks to the resources I've found on this:

"Congo" by David van Reybrouck

BBC documentary: https://www.youtube.com/watch?v=dMAegyRzYx8

And many more stories, and books