William Clark Styron Jr. (June 11, 1925 - November 1, 2006) was an American novelist and essayist who won major literary awards for his work. Styron was best known for his novels, including: Lie Down in Darkness (1951), his acclaimed first work, published when he was 26; The Confessions of Nat Turner (1967), narrated by Nat Turner, the leader of an 1831 Virginian slave revolt; Sophie's Choice (1979), a story "told through the eyes of a young aspiring writer from the South, about a Polish Catholic survivor of Auschwitz and her brilliant but psychotic Jewish lover in postwar Brooklyn". In 1985, he suffered from his first serious bout with depression.

Styron's next two novels, published between 1967 and 1979, sparked much controversy. Feeling wounded by his first truly harsh reviews, for Set This House on Fire, Styron spent the years after its publication researching and writing his next novel, the fictitious memoirs of the historical Nathaniel "Nat" Turner, a slave who led a slave rebellion in 1831.  During the 1960s, Styron became an eyewitness to another time of rebellion in the United States, living and writing at the heart of that turbulent decade, a time highlighted by the counterculture revolution with its political struggle, civil unrest, and racial tension. The public response to this social upheaval was furious and intense: battle lines were being drawn. In 1968, Styron signed the "Writers and Editors War Tax Protest" pledge, a vow refusing to pay taxes as a protest against the Vietnam War.  In this atmosphere of dissent, many had criticized Styron's friend James Baldwin for his novel Another Country, published in 1962. Among the criticisms was outrage over a black author choosing a white woman as the protagonist in a story that tells of her involvement with a black man. Baldwin was Styron's house guest for several months following the critical storm generated by Another Country. During that time, he read early drafts of Styron's new novel, and predicted that Styron's book would face even harsher scrutiny than Another Country. "Bill's going to catch it from both sides," he told an interviewer immediately following the 1967 publication of The Confessions of Nat Turner.  Baldwin's prediction was correct, and despite public defenses of Styron by leading artists of the time, including Baldwin and Ralph Ellison, numerous other black critics reviled Styron's portrayal of Turner as racist stereotyping. The historian and critic John Henrik Clarke edited and contributed to a polemical anthology, William Styron's Nat Turner: Ten Black Writers Respond, published in 1968 by Beacon Press. Particularly controversial was a passage in which Turner fantasizes about raping a white woman. Styron also writes of a situation where Turner and another slave boy have a homosexual encounter while alone in the woods. Several critics pointed to this as a dangerous perpetuation of a traditional Southern justification for lynching. Despite the controversy, the novel was a runaway critical and financial success, and won both the 1968 Pulitzer Prize for Fiction, and the William Dean Howells Medal in 1970.

Answer the following question by taking a quote from the article: When did the controversy begin?
During the 1960s, Styron became an eyewitness to another time of rebellion in the United States,