Pet peeve of the moment: "free of charge"

As in, "Classes are offered free of charge."

I guess plain old "free" isn't good enough, because the public might get really confused and think you mean "free from oppression." Or "sugar-free."

Astute copy grrls and bois will notice the sentence also contains a superfluous "offered." I promise you, gentle readers. If you simply say "Classes are free," your audience will understand that the classes are being offered.