Greater Manchester Mayor Andy Burnham led a protest outside the McVitie's factory in Stockport against plans to cut almost 160 jobs.
He was joined by union members, Stockport Council leader Elise WIlson as well as MP Navendu Mishra who said the move would be "reprehensible", the Manchester Evening news reported.
The protest, which took place outside the UK's only chocolate refinery on Wednesday, May 4, came after owner Pladis confirmed plans to cut 159 jobs in March.