> Estimates given by various archaeologists for the size of the workforce at Giza tend to hover around 10,000 people for all three pyramids. These people were well-fed; in a study published in 2013, Richard Redding, the chief research officer at AERA, and colleagues found that enough cattle, sheep and goats were slaughtered every day to produce 4,000 pounds of meat, on average, to feed the pyramid builders. The finding was detailed in the book "Proceedings of the 10th Meeting of the ICAZ Working Group 'Archaeozoology of Southwest Asia and Adjacent Areas'" (Peeters Publishing, 2013). Redding used the animal bone remains found at Giza, and the nutritional requirements for a person doing hard labor, to make the discovery.
> Redding also found that animals were brought in from sites on the Nile Delta and kept in a corral until they were slaughtered and fed to the workers.
> The workers' meat-rich diet may have been an inducement for people to work on the pyramids, Redding said. "They probably got a much better diet than they got in their village," Redding told Live Science in 2013.
> Dieter Wildung, a former director of Berlin's Egyptian Museum, said it is "common knowledge in serious Egyptology" that the pyramid builders were not slaves. "The myth of the slaves building pyramids is only the stuff of tabloids and Hollywood," Wildung said. "The world simply could not believe the pyramids were build without oppression and forced labour, but out of loyalty to the pharaohs."
> Hawass said the builders came from poor families from the north and the south, and were respected for their work – so much so that those who died during construction were bestowed the honour of being buried in the tombs near the sacred pyramids of their pharaohs.
> Their proximity to the pyramids and the manner of burial in preparation for the afterlife backs this theory, Hawass said. "No way would they have been buried so honourably if they were slaves."
Kind of annoyed I can't find a single university website which says this using a quick google, but I guess most scholars don't make a big deal about common knowledge.