The CIA and the DEA buy and trade drugs and weapons to help arm groups that they believe will help advance the interests of the US Government. Here is a really good documentary about it.

https://www.youtube.com/shared?ci=26N6LIjTDhg

Also, if you substitute Contras with Syrian Rebels and cocaine with heroin you can see we are going full circle again. Same players (Russia, US) same "non-establishment" type President, same type of drug epidemic levels. Everything is the same. You even have government officials pleading for the US to intervene because the rebels are going hungry and there is a sob story to attach to them.

I really recommend you watch this and check it's sources. We have found the template, now we have to work against it.