Yemeni Jews and Arab Tribes
"'Weak' people...do not have the tribesman's ability to intervene in affairs between other tribesmen by taking someone into their peace and providing protection. In the game of tribal honour and standing, they are not recognized as players. For a tribesman to offend against a weak person is a disgrace, although in practice the offence must be recognized as such by other tribesmen; that is, by men who themselves have honour and are capable of demanding and exacting amends."
Dresch also mentions a specific example:
"Hayyim Habshush relates a late nineteenth-century case where a Jew was killed by a tribesman, and an assembly of shaykhs from Hashid and Bakil judged that the killer's people should pay four times the blood-money. The possibility that the killer himself should be killed was waived on the grounds that he was mad, which may or may not have been so, and the compensation was divided: half to the dead Jew's kin and half to the tribesmen 'on whose honour' he had lived."
Other people who fell into the weak category were barbers, sellers of qat, coffeehouse owners, and sellers of vegetables.