As a Shell insider I need to stay anonymous but I will point you to the right story.
As you possible know, there are export restrictions to export software and technology which is US based to restricted countries like Iran, Sudan, Syria, North Korea and Cuba. Shell violates this export restrictions as Shell is using software and technology without a valid export license.
One example will be that in the joint venture from Shell and Sinopec both companies are using Microsoft Windows Operation system. They never got a valid license from the US government. It looks like that in some cases Shell take the business risk only for profit to make business with terrorists.