Huawei Technologies Co. is planning extensive layoffs at its U. S. surgeries, according to people familiar with the matter, as the Chinese tech giant continues to have trouble with its own American black listing.

The layoffs are expected to affect workers at Huawei’s U. S.-based research and development subsidiary, Futurewei Technologies, based on these people. The system employs approximately 850 people in research labs over the U.S., including in Texas, California and Washington state.