The Marxist Internet Archive, a website devoted to radical writers and thinkers, recently received an email: It must take down hundreds of works by Karl Marx and Friedrich Engels or face legal consequences.

The warning didn’t come from a multinational media conglomerate but from a small, leftist publisher, Lawrence & Wishart, which asserted copyright ownership over the 50-volume, English-language edition of Marx’s and Engels’s writings.

To some, it was “uncomradely” that fellow radicals would deploy the capitalist tool of intellectual property law to keep Marx’s and Engels’s writings off the Internet. And it wasn’t lost on the archive’s supporters that the deadline for complying with the order came on the eve of May 1, International Workers’ Day.