Huawei Technologies has emerged as the world's second-largest maker of networking gear thanks to growth in China, Europe, and emerging markets. The U.S. business is a different story. Just $1.3 billion of its estimated $35 billion in 2012 sales came from America. Now, amid rising congressional concerns about Chinese government-sanctioned hacking, Huawei may lose one of its most important stateside customers: Level 3 Communications, which runs a massive broadband network that helps carry traffic for most telecoms.
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