That's only if you consider the ACFTU a union in any meaningful sense of the word. The International Confederation of Free Trade Unions doesn't.

There are no real unions in China, these organizations are all part of the Party. If you run any organized civil group in China with more than 100 members, you can be sure to be invited for a "talk" to the local Party headquarters, and depending on your willingness to cooperate, that visit may end very negativly for you. The one thing the Party is really afraid of are people organizing themselves.

"In America you go to party. In China, party come to you!"

(post Soviet and all)