More than 100 writers, including Pulitzer Prize winners Alice Walker, Richard Ford and Junot Díaz, have called on the PEN American Center “to reject support from the embassy of Israel” in a furious open letter.

Sent to PEN American Center and other festival participants in March but published online on Wednesday, the letter opposes the Israeli embassy’s sponsorship of PEN’s annual World Voices Festival (PWVF), a seven-day event in New York at the end of this month.