Long before Rosa Parks was hailed as the "mother of the civil rights movement," she wrote a detailed and harrowing account of nearly being raped by a white neighbor who employed her as a housekeeper in 1931.

The six-page essay, written in her own hand many years after the incident, is among thousands of her personal items currently residing in the Manhattan warehouse and cramped offices of Guernsey's Auctioneers, which has been selected by a Michigan court to find an institution to buy and preserve the complete archive.

It helps explain what triggered Parks' lifelong campaign against the ritualistic rape of black women by white men, said McGuire, whose recent book "At the Dark End of the Street" examines how economic intimidation and sexual violence were used to derail the freedom movement and how it went unpunished during the Jim Crow era...