The Library of Congress’ annual book sale has been canceled to comply with new rules set forth by the Office of Personnel Management.

Proceeds of the book sale, which dates back to the 1970s and was open to the general public, benefited the general fund of the Combined Federal Campaign. It occurred annually over three days in October and all the books were donated by employees at the library — they were not actually Library of Congress books.

But, while it was considered a “fundraising” event, it can no longer go on.

Kathleen M. McGettigan, acting director of OPM, put out a memo Aug. 3 about the Combined Federal Campaign, known as the CFC, which federal employees can contribute to for various national and international causes.

The memo announced that Housing and Urban Development secretary Ben Carson is the 2017 chairman of the CFC as well as a new system of donating, effective Oct. 2.