A labour union at STMicroelectronics said on Monday the Franco-Italian company was considering a restructuring plan that could involve laying off around 1,000 of its 1,100 French-based staff or a sale of the DPG division they work in. The CFE-CGC union, which discussed the matter with an official at President Francois Hollande's offices on Friday, released a copy of a letter it has sent to the French finance ministry on the subject.