The ISA is one of the most feared branches of the GIC by those with some insight. By the general public they’re simply known as the bodyguards of the Senators and the Chairman but there’s a much more sinister side to the agency.
Many of their top agents are expert assassins, torture experts who work above and beyond the law with unlimited resources at their disposal. They are completely committed to the perseverance of the GIC rule. They never question their orders, their masters or even their own actions no matter how atrocious as it is all done for "the greater good."