They did up until.... Then, about 18 months ago, two U.S. domestic manufacturers filed a complaint. About 90 days ago, the U.S. Department of Commerce found in their favour and imposed countervailing duties of between 33% and 165% on Chinese cable.
I know anecdotally from being in the U.S. that there are still people getting around it with transshipping. They ship it into Korea. They put little connectors on the end and sell it as an assembly. There are a lot of tricks, but at least their government has recognized the damage to the industry. In our industry, if you search the Encore-Southwire Department of Commerce ruling, there's quite a lot of information available.