Breen Confederacy

The Breen Confederacy was the interstellar state of the Breen species. It was the fourth largest entity in the known alpha and beta quadrants. Only the United Federation of Planets, the Klingon Empire, and the Tholian Assembly were larger, the latter two being neighbors of the Breen.
The Breen Confederacy was headed by the Breen Domo.
== History and specifics ==
In 2375, under the leadership of Thot Gor, the Breen Confederacy allowed itself to be annexed by the Dominion, joining the Dominion War during the conflict's final months. Forces from the Breen Confederacy launched an attack upon Earth, the capital of the United Federation of Planets, destroying much of Starfleet Headquarters, San Francisco, and other cities killing thousands.
While Breen forces initially led to several Dominion victories due to their energy-dampening weapon, the weapon was later countered, and the Breen later surrendered with the rest of the Dominion in orbit of Cardassian Prime. The subsequent peace treaty re-established the Breen Confederacy and the Cardassian Union as independent states.
The Breen Confederacy remained an object of objection for many in the Federation following the war.
== Politics ==
As was the case with most things surrounding the Breen, the nature and operation of their government was a mystery. Noted diplomatic observers had stated that they always dealt with an ever changing cast of lower ranking functionaries. These individuals were also quite reluctant in revealing their identities. The only determining factor in observations of Breen society was that their military officials made the high level decisions and there did not appear to be any civilian government.
Relations between the Federation and the Breen were described as tenuous at best by the year 2360. The territory of the Breen Confederacy resided near that of the Sheliak Corporate. This was a source of conflict between the two empires.
They also had some form of conflict with the Romulans with the Breen Confederacy managing to either emulate or steal cloaking technology from the Romulan Star Empire. Despite this hostility between the two, the Romulans never managed to decisively reach the Breen homeworld. 
Intelligence reports on Breen society and biology were consistently inconsistent and contradictory. It was only recently that a team of undercover operatives, after they made it inside Breen space,and analysis by the "Jack Pack" revealed the Breen are in fact several different species working together. The suits employed by the Breen Confederacy were designed to provide every member of the Confederacy an equal chance to have success so that they were not biased against because of their species. Some of the more notable species include the human-like Silwaan; the Fenrisal, whose snouts required the distinctive shape of the Breen helmet; the bloodless Amoniri, who require refrigeration in their suits to prevent evaporation; and the Paclu, whose four-lobed brains defy telepathy.
In 2409, Thot Trel used his influence to lead a pirate fleet into Deferi territory, the Orellius sector block. Trel's forces resorted to slavery and ransacked Defera Prime and became a menace for travel in the Deferi and Raveh sectors.
Trel sought ancient weapons from the Preserver Archive on Lae'nas III but found his plans disappointed by the peaceful Progenitors. He was ultimately stopped by the Deferi's allies. However, some Breen dissidents joined the allied forces, retaining their refrigeration suits, inspired Medic Tran.