In this Free21 radio interview, the Swiss historian and controversial author, Dr. Daniele Ganser claims that USA supports terrorist organizations with money, food and weapons. He claims that the USA does this so that the Syria opposition gains power from US support in their conflict with the current Russia-friendly leadership. He also references unnamed Iranian newspapers stating US Army performs weapon drops for IS.
The hosts of the interview, Free21 claim to be a independent journalistic platform, but reading their other articles, in my opinion, stretch their interpretations too far from the sourced facts, so this does not support its credibility.
But it wouldn't be the first time of the CIA using such methods (including assassinating anti-USA leaders), so it would not be completely implausible.
So: Does/Did the USA support terrorist organization like IS/ISIS or Al-Qaeda with weapons/money?