A 2003 article in Harvard Magazine on the life of the Archeaologist Mark Lehner notes that:
Rooted firmly in the popular imagination is the idea that the pyramids were built by slaves serving a merciless pharaoh. This notion of a vast slave class in Egypt originated in Judeo-Christian tradition and has been popularized by Hollywood productions like Cecil B. De Mille’s The Ten Commandments, in which a captive people labor in the scorching sun beneath the whips of pharaoh’s overseers.
This was certainly my image though it owes more to childhood viewings of the Prince of Egypt than anything else. To be fair this idea took root for a good reason: Herodotus stated that the builders of the pyramids were indeed slaves.
However, as the Harvard Magazine article goes on to explain discoveries by Lehner and his colleagues that the workers ate meat and that there were extensive bakeries on the sight cast doubt on this theory.
There were slaves in Egypt, says Lehner, but the discovery that pyramid workers were fed like royalty buttresses other evidence that they were not slaves at all, at least in the modern sense of the word. Harvard’s George Reisner found workers’ graffiti early in the twentieth century that revealed that the pyramid builders were organized into labor units with names like “Friends of Khufu” or “Drunkards of Menkaure.” Within these units were five divisions (their roles still unknown)—the same groupings, according to papyrus scrolls of a later period, that served in the pyramid temples. We do know, Lehner says, that service in these temples was rendered by a special class of people on a rotating basis determined by those five divisions. Many Egyptologists therefore subscribe to the hypothesis that the pyramids were also built by a rotating labor force in a modular, team-based kind of organization.
If not slaves, then who were these workers? Lehner’s friend Zahi Hawass, secretary general of the Supreme Council of Antiquities, who has been excavating a “workers’ cemetery” just above Lehner’s city on the plateau, sees forensic evidence in the remains of those buried there that pyramid building was hazardous business. Why would anyone choose to perform such hard labor? The answer, says Lehner, lies in understanding obligatory labor in the premodern world. “People were not atomized, separate, individuals with the political and economic freedom that we take for granted. Obligatory labor ranges from slavery all the way to, say, the Amish, where you have elders and a strong sense of community obligations, and a barn raising is a religious event and a feasting event. If you are a young man in a traditional setting like that, you may not have a choice.” Plug that into the pyramid context, says Lehner, “and you have to say, ‘This is a hell of a barn!’”
Lehner currently thinks Egyptian society was organized somewhat like a feudal system, in which almost everyone owed service to a lord. The Egyptians called this “bak.” Everybody owed bak of some kind to people above them in the social hierarchy. “But it doesn’t really work as a word for slavery,” he says. “Even the highest officials owed bak.”
“These tombs were built beside the king’s pyramid, which indicates these people were not by any means slaves,” Zahi Hawass, the chief archaeologist heading the Egyptian excavation team, said in a statement. “If they were slaves, they would not have been able to build their tombs beside their king’s.”
Though they were not slaves, the pyramid builders led a life of hard labor, said Adel Okasha, supervisor of the excavation. Their skeletons have signs of arthritis, and their lower vertebrae point to a life passed in difficulty, he said. “Their bones tell us the story of how hard they worked,” Okasha said.