Intelligence activities include collection of information of political, financial, scientific and military interest.

The origin can be traced back to the General Staff's Intelligence Section (Danish: Generalstabens Efterretningssektion) created 1911 and the Naval Staff's Intelligence Section (Danish: Marinestabens Efterretningssektion) created 1920s & served in World War I & II.

[7] The agency is accused of failing to investigate espionage in the armed services and of obtaining and passing on information about Danish citizens.

[7] In December 2021, Findsen and three others were arrested and charged with leaking top secret information.

[8] On 13 December 2021, five days after Findsen's arrest a commission tasked with investigating the allegations leading to the suspensions cleared the intelligence agency and its employees of any wrongdoing.

[7] Kaspar Wester of Danish news site OLFI said to BBC: "The supervisory agency suggests that Lars Findsen has played an active part in withholding information or even deliberately misinforming the supervisory agency.

[7] In May 2021, it was reported that DDIS collaborated with National Security Agency (NSA) to wiretap on fellow EU members and leaders,[10][11] leading to wide backlash among EU countries and demands for explanation from Danish and American governments.

[13][14] The Sandagergård station near Copenhagen is an electronic reconnaissance base of FE to monitor data-based communication.