The Titan Biology Research Society is a Marleyan organization dedicated to the study of Eldian people and the true nature of the Titans.
Duty: Established sometime after the Great Titan War, the Titan Society focuses on analyzing the nature of the Subjects of Ymir and their connections with the Titans and Titan powers. Information gathered from the Titan Society is shared with members of the Marleyan military, though it appears that members of the Eldian population within Marley are not informed. It is unknown whether the common Marleyan population is given the information obtained by the Society.
Findings: Sometime before the year 832, the Titan Society proposed a theory that centers around the Founding Titan: All Titans and Subjects of Ymir are connected to each other through invisible "paths" that transcend physical space, and these "paths" converge at a single coordinate; this so-called "Coordinate" is the Founding Titan. In later years, the Titan Society also researched the strange case of Zeke Jaeger, who could inexplicably control Titans created with his spinal fluid; however, no conclusive results were made concerning this phenomenon. The Titan Society is unaware that Zeke possesses royal blood, granting his Beast Titan powers similar to those of the Founding Titan itself.
Developments: Over multiple decades, the Titan Society was able to develop multiple objects and weapons linked to the Titan powers in order to help the Marleyan military's goals. The organization is responsible for all the serums made of Titan spinal fluid that have been created in Marley. Being a serum-based method of transforming Subjects of Ymir into Titans, the Marleyan authorities have used it countless times over the years in order to turn Eldian criminals and traitors into Titans in order to wander the non-Walled territories of Paradis Island, or attack enemy armies in imperialistic conflicts against different countries around the world.
Source: Titan Biology Research Society (Anime), available under CC BY-SA 3.0.