A request under this subpart may be filed by an entity, including a firm, or group or workers, trade association, or certified or recognized union which is representative of a domestic industry producing a perishable product like or directly competitive with a perishable product that such entity claims is being imported into the United States duty-free under the provisions of the Act from a beneficiary country(ies) in such increased quantities as to be a substantial cause of serious injury, or the threat thereof, to such domestic industry.