People are referred to using the relative pronouns “who” or “whom”: the students who left. Institutions, objects and other nonhuman things use the relative pronouns “that” and “which”: the company that owns the building. Textbook: 16:2.C
Companies, unions, schools and other institutions are considered singular; they take singular pronouns and verbs: Kent State is reopening its admissions process. Textbook: 16:2.D01