A terrorist group is a group of people who use violence and intimidation to achieve their goals. They aim to spread fear and harm innocent people to create chaos or to push for certain political or religious beliefs. Full definition
Nor do they know that there are lists of terrorists groups that they are required to consult, or how to locate those lists. (remonline.com)
This completely ignores the fact that nuclear power generates radioactive waste, can never be 100 % safe and is a magnet for terrorist groups seeking targets and materials for attacks. (evworld.com)
Many other terrorist groups now aspire to attack us. (politics.co.uk)