TUPPER LAKE, N.Y. — Immigrations and Customs Enforcement conducted a raid Feb. 18 at Tupper Lake Pine Mill in New York state and detained nine employees. In a statement …the parent company of the mill, The Matra Group, said that the employees were authorized to work in the U.S. …“Nine employees were detained, all of whom were, to our knowledge, authorized to work in the United States, as we verify all employees through the I-9 process,” Nicholas Drouin, Matra co-president and director of manufacturing said. All U.S. employers must follow that process to verify workers’ identities and employment eligibility. …The mill — formerly known as the Tupper Lake Hardwoods Inc. — is owned by the Quebec-based Matra Group, a lumber harvesting and distribution company.