In a claim under section 301 of the Labor Management Relations Act, arising out of a reduction in workforce, the District Court’s grant of summary judgment to union defendant, plaintiff's former union, is reversed where: 1) the Seniority Agreement, which had been negotiated on her behalf by a union representative, was neither inadmissible under the parol evidence rule nor superseded by the 2008 CBA; and 2) plaintiff also established a triable issue whether the union breached its duty of fair representation by processing her grievance in a perfunctory manner.