Updated by Joseph Stromberg on June 18, 2014, 11:40 a.m. ET @josephstromberg joseph@vox.com
This isn't the first time the "Redskins" trademark registration has been cancelled
The Lanham Act of 1946 holds that "No trademark… shall be refused registration on the principal register on account of its nature unless it consists of… matter which may disparage or falsely suggest a connection with persons, living or dead, institutions, beliefs."
For decades, various groups of Native Americans have been trying to use this law to cancel the "Redskins" trademark registration. In 1992, a group led by Suzan S. Harjo filed a similar suit, and the Patent and Trademark Office agreed with them in 1999, canceling the trademark registration.