An open letter has been sent to Toys R Us CEO Jerry Storch in the US petitioning to withdraw UFC toys from sale.
The petition from the Culinary Workers Union Local 226 was sent to Toys R Us over the Christmas period, reports Five Knuckles.
"Part of a parent's job is to attempt to teach our children to value and respect the dignity of every human being," read the open letter.
"It is also necessary to struggle to keep children safe. We do not need toys that glorify famous athletes or entertainers who choose to promote hatred, intolerance and violence with their words.
"Everyday women must struggle against violence, as well. Allowing or glorifying this behaviour of bullying, uncontrolled anger, and using hate speech against other human beings is not acceptable."
It's the latest battle between the Culinary Union and Ultimate Fighting Championship owners Frank and Lorenzo Ferttita, who have been criticised by the union over their alleged unwillingness to allow unions in their Las Vegas, Nevada casinos or the UFC.
Want to receive up to the minute toy industry news straight to your inbox? Click here to sign up for the free ToyNews Daily Digest and Newsflash services. You can also follow ToyNews on Twitter and Facebook.