Seeking ever-higher payments from publishers to bolster its anemic bottom line, Amazon is holding books and authors hostage on two continents by delaying shipments and raising prices. The literary community is fearful and outraged — and practically begging for government intervention.

“How is this not extortion? You know, the thing that is illegal when the Mafia does it,” asked Dennis Loy Johnson of Melville House, echoing remarks being made across social media.

Amazon is, as usual, staying mum. “We talk when we have something to say,” Jeffrey P. Bezos, the founder and chief executive, said at the company’s annual meeting this week.