Public Security Authorities

The are an internal military/security organization stationed in Marley.

Purpose
The Public Security Authorities are responsible for maintaining order within the Eldian internment zones (such as the Liberio Interment Zone) on the continental mainland. It includes restricting movement in and out of the ghettos, countering Eldian dissident movements, and sending undesirable Eldians to the island of Paradis where they are turned into mindless Titans.

Brutal behavior against the Eldians by its troopers are not discouraged, or are at least left unchecked, within the force. For example, PSA member Gross had his sons sadistically killed Fay by unleashing a horde of dogs upon her for entertainment. The deed did not seem to hurt his career, as by the time of Grisha's exile to Paradis he had attained, or was still keeping, the rank of Sergeant Major.

As Marley decided to move against Paradis to secure its vast fossil resource, the PSA are also tasked with recruiting Warriors from among the Eldian children aged 5-7 in service of the Marleyan state with promise of granting "Honorary Marleyans" status to the families of those chosen. Zeke, Bertolt, Reiner, Annie are known to be among those chosen children. It seems the Warrior recruits were subjected to pro-Marleyan indoctrination as part of their training, as Zeke exposed the identity of his parents after he was selected.

It is unclear whether or not the PSA's jurisdiction extends outside of the ghettos and cover the whole of Marleyan society. However, it does operate an outpost on the coastal borderline of Paradis for the purpose of exiling undesirables into the island.

Organisation
The PSA seem to have ranking structure similar to a real world Western military, with Gross holding the rank of Sergeant Major before his death.

Despite its power, the PSA was actually heavily infiltrated by the Eldian Restoration Movement to the extent that the latter was able to get its hands on censored historical records and important government documents. For example, Kruger, aka "the Owl", was a high-value Eldian agent who managed to become at least on par with Gross within the PSA command hierarchy. It was not until Zeke Yeager's defection that the PSA was able to weed out most of the conspirators. The role and behavior of its troopers seems to make it analogue to the Military Police Brigade within the walls in Paradis.

Equipment
The PSA uniform consists of a soft edge peaked cap with a leather visor, trench coat, a "Sam Browne" style leather belt, a shirt which is worn with a black tie, and a pair of leather jackboots. Its troopers are armed with advanced small-arm weaponry such as bolt-action rifles and revolvers.

Prior to its destruction at the hands of Kruger, the PSA operated at least one steamboat for transportation to the borderline of Paradis where an outpost on the coast of Paradis is located. The outpost is built with a pier by the foot of a 30-meter wall surrounding a small segment of the coastline.