What is an example of an allusion in The Scarlet Letter?

Allusions * Anne Hutchinson, mentioned in Chapter 1, The Prison Door, was a religious dissenter (1591-1643). In the 1630s she was excommunicated by the Puritans and exiled from Boston and moved to Rhode Island.[5] * Martin Luther (1483-1546) was a leader of the Protestant Reformation in Germany. * Sir Thomas Overbury and Dr. Forman were the subjects of an adultery scandal in 1615 in England. Dr. Forman was charged with trying to poison his adulterous wife and her lover. Overbury was a friend of the lover and was perhaps poisoned. * John Winthrop (1588-1649), first governor of the Massachusetts Bay Colony. * King's Chapel Burying Ground in the final paragraph exists; the Elizabeth Pain gravestone is traditionally considered an inspiration for the protagonists' grave. * Richard Dawkins' Out Campaign is represented with the Scarlet Letter A emblem.