A group of five U.S. senators have joined the growing chorus of influential voices, telling the Kellogg Co. to end its nearly five-month lockout of more than 220 workers at its Memphis, Tenn., cereal production facility.The Bakery, Confectionery, Tobacco Workers and Grain Millers (BCTGM) Local 252G members who make Frosted Flakes®, Froot Loops® and other breakfast favorites were locked out as part of the drive by the company to replace steady, middle-class, full-time jobs with casual part-time employees who would make significantly lower wages and substandard benefits.In a letter to Kellogg’s CEO John Bryant, Sens. Sherrod Brown (D-Ohio), Robert Casey Jr....