Vagrancy
From Memory Alpha, the free Star Trek reference
Vagrancy is a state of poverty and homelessness. Those in such a state are referred to as vagrants, and typically have no job or regular source of income. Some governments consider vagrancy to be a crime.
One place where vagrancy is a crime is Thalos VI. The prescribed penalty there is a fine, and if one cannot pay it, imprisonment in a prison until they can.
Gaila was arrested on Thalos VI for vagrancy in 2374. Though he was unable to pay his fine, his cousin Quark did so in order to recruit him for a mission to rescue Ishka from the Dominion. (DS9: "The Magnificent Ferengi")
