Inca Class System
"The Inca were not only fierce conquerors but they also had a violent punishment system. If someone stole, murdered, or had sex with a Sapa wife or a Sun Virgin, they were thrown off a cliff, hands cut off or eyes cut out, or hung up to starve to death. Prisons were of no use because punishment usually consisted of death" - (http://www.mnsu.edu/emuseum/prehistory/latinamerica/south/cultures/inca.html)
They were clearly a highly developed class society, as outlined in the wikipedia entry - http://en.wikipedia.org/wiki/Inca_society :
"The descendants of the original Inca tribe were not numerous enough to administer their empire without help. To cope with the need for leadership at all levels the Inca established a civil service system. Boys at age of 13 and girls at age of first menstruation had their intelligence tested by the local Inca officials. If they failed, their ayllu (extended family group) would teach them one of many trades, such as farming, gold working, weaving, or military skills. If they passed the test, they were sent to Cuzco to attend school to become administrators. There they learned to read the quipu (knotted cord records) and were taught Inca iconography, leadership skills, religion, and, most importantly, mathematics. The graduates of this school constituted the nobility and were expected to marry within that nobility.
While some workers were held in great esteem, such as royal goldsmiths and weavers, they could never themselves enter the ruling classes. The best they could hope for was that their children might pass the exam as adolescents to enter the civil service. Although workers were considered the lowest social class, they were entitled to a modicum of what today we call due process, and all classes were equally subject to the rule of law. For example, if a worker was accused of stealing and the charges were proven false, the local official could be punished for not doing his job properly.
Social Classes Representatives Inca
* Sapa Inca
Royalty
* The Auqui: Son of the Sapa Inca. * The Coya: Wife of the Sapa Inca * Royal Panacas: First generations of each Pañaca ( royal relative).
Nobility
* Nobility of Blood: Other members of las Pañacas (royal relatives). * Nobility of Privilege: Those who had attained distinction through
their services; Sacerdotes & Acllas; High chiefs.
Ayllu
* Hatun Runa: The general public. * Mitimaes: Those belonging to newly conquered races. * Yanaconas: Servers of the Inca and Empire, many of which were prisoners."