terrorist organization
Refers to a group that uses violence and intimidation, especially against civilians, for political aims.
そのテロ組織は犯行声明を出した。
The terrorist organization issued a claim of responsibility.
国際社会はテロ組織の資金源を断とうとしている。
The international community is trying to cut off the funding sources of terrorist organizations.
Compound of テロ (from English 'terror', short for 'terrorism') and 組織 (organization).