(Radio.com) One half of the massively successful '90s dance music duo C&C Music Factory is accusing one of their featured collaborators of stealing the group's name.

Over the weekend, Robert Clivilles of C&C Music Factory posted an open letter to Freedom Williams, who rapped on two of the group's most famous singles, "Gonna Make You Sweat (Everybody Dance Now)" and "Things That Make You Go Hmmm."

According to Clivilles, Williams was never actually a member of the group (the songs were credited to "C&C Music Factory Featuring Freedom Williams"), but copyrighted the group's name and now tours as C&C Music Factory.

Clivilles ended C&C in 1996, following the death of the other half of the group, David Cole. In his open letter, published to his Facebook page, Clivilles addressed the rapper. "As you and everybody else in this world well knows by now, in late 1990 I wrote and produced a song for a group I then signed known as 'Trilogy.'"

That song, Clivilles says, was "Gonna Make You Sweat (Everybody Dance Now)," and that Trilogy ultimately decided not to record the song. That, Clivilles said, led him and Cole to create a group name to record the song on their own. And so C&C Music Factory, "aka the Clivilles & Cole Music Factory," was born. Read more here.