Van Dieu
| 機關文化吧調查 Cơ quan Văn hóa và Điều tra | |
 Emblem of the Van Dieu | |
| Agency overview | |
|---|---|
| Formed | 1965 |
| Jurisdiction |  Nainan |
| Motto | Protect the homeland. 保衛圭鄉. Bảo vệ quê hương. |
| Employees | Unknown |
| Annual budget | Unknown |
| Ministers responsible | |
| Agency executive |
|
| Parent department | Office of the State Director Central Council of Nainan |
The Authority of Culture and Investigation(Nainese:機關文化吧調查; Cơ quan Văn hóa và Điều tra), commonly referred to as the "Van Dieu" (Nainese:文調) is the central intelligence agency of The Harmonious Republic of Nainan. It is the overarching agency of the nation and oversees all areas of intelligence. It is responsible to both the State Director of Nainan and the Central Council of Nainan.
The Van Dieu was founded in 1965 by Hoàng Viện Trai and the Nainan People's Solidarity and Longevity after their victory in the Nainese Civil War. During the civil war there was no official intelligence agency in the service of the nationalists. The agency was mostly made up of previous soldiers in the war and was tasked with crushing dissent in the newly established Harmonious Republic. During the late 1960's it began to rid Nainan of the NPSL's rivals and began to perform intelligence operations against socialist movements in Southeast Coius, namely against the United Zomi Councils during the Trucial Wars. After Hoàng's assassination in 1972 the Central Council decided that Van Dieu head and Premier Nghiêm Nài Phúc would replace him, this lead to growth of the agency's power immensely. They continued to grow in power over the next two decades and had been able to counter movements against the government. Only since the turn of the century has the group had some of it's authority rolled back slightly.
The Van Dieu has also worked alongside the Shangean Shujichu in their operations. The agency has been accused of using unethical and excessive tactics in crushing dissent and has been called a secret police force, it has been accused of excessive force, assassinations, kidnappings, and sabotage. The Van Dieu's brutal history has lead to it becoming one of the most feared police agencies in the world and has been also been accused of state terrorism against it's people.