The USSR was who created the PLO and they have been supporting the Iranian state since 1978.
Islam and Communism go hand in hand.
One is a political system pretending to be a religion and the other is a religion pretending to be a political system.
The economic underpinnings of Islam are, in fact, almost completely compatible with most varieties of socialism, be it Communism, the Nationalist Socialist Workingmen’s Party, or the Fabian socialism of England. All socialists, and Islam, despise the way banks are organized under capitalistic economic systems, in that collection of interest on money that is loaned out is essentially theft, and that bankers are to be kept on a very short leash, controlled to the degree that they may be summarily removed from their positions if they fail to do the bidding of the controlling regime. Any judgment as to the comparative value/worth of directing investments in one direction or another resides with the regime, and is not subject to market forces.
The Islamic nations are, for the most part, almost completely devoid of any industrial development save that of the extraction and processing of petroleum, or the development of military weapons of war. They are not geared up for civilian consumer wants or needs, relying almost exclusively on importing these from other countries. Socialist regimes do not consider the aspects of supplying consumer wants and needs, but rely on a rationing system of some kind for distribution of goods and services. So on at least a superficial level, the overlay of Islam on the socialist economic model would not have much in the way of conflict, but socialists being socialists and basically anti-religious of ANY kind, it would be only a matter of time before the humanism of Socialism comes to grips with the theocracy of Islam, and there would be bloodlettings that would make the French Revolution or the sweep of Genghis Khan through Asia seem like the idle carnage of a video game.