For people who wonder 'but how do these organizations get all that £€¥$ to fund their terrorism acts?<p>Drug trafficking, robberies, kidnapping. Counterfeit products and human trafficking are also two more standard 'revenue streams'. In the case of ISIS apparently it was stealing and selling Oil. Depending on the country you live in, bank robberies either contribute to a gangs' income, or if funds local or international terrorism. This is the main reason police does its best to arrest them. The loss of a bank's £€¥$ is bad, threatening some bank employees and customers is bad, funding the next 'Sri Lanka' is far worse (I am NOT pointing fingers or taking sides - just using this example as it was the most recent).