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[LOTR] How are Hobbits politically and Military organized?

All the societies/races we encounter in Middle Earth seem to have a form of leadership, political organization, or a least have military units ready to defend their borders.

What about Hobbits? What prevent any band of thugs to invade their lands?
gpt
From Tolkien Gateway

"Initially, The Shire was a part of Arthedain. The Hobbits considered themselves as subjects of the King and only after the fall of Arnor, the Shire became an independent political unit led by the Thain from Tuckborough who was the head of the important Took clan. While nominally the Thain ruled over the four Farthings, in practice authority was so decentralised that the title was seen as more of a formality and ceremonial.

Official of the Shire was the Mayor of Michel Delving in the White Downs (by extension seen as the mayor of the Shire). The Mayor's chief duties were serving as postmaster of the Shire's Messenger Service, charging the Watch and presiding at fairs

Finally, the Master of Buckland at Bucklebury controlled Buckland.

The sole law enforcement officials in the Shire were the Shirriffs. Their job was to protect the Shire from trespassers more than anything. There were three in each Farthing, and were distinguished from "civilians" by a feather worn in their caps. The Bounders were the land's border-guard, charged with turning back unwanted people or beasts, and their number varied according to need.

The Shire was originally divided in four Farthings (Northfarthing, Southfarthing, Eastfarthing, and Westfarthing), but Buckland and later the Westmarch were added to it. Within the Farthings there are some smaller, unofficial divisions such as family lands: the Tooks nearly all live in or near Tuckborough in Tookland, for instance. In many cases a Hobbit's last name indicates where their family came from: Samwise Gamgee's last name derives from Gamwich, where the family originated. Outside the Farthings, Buckland itself was named for the Oldbucks (later Brandybucks)."