The GMB has won the right to negotiate pay and conditions at a crisp factory in the north east of England.
Union recognition was achieved after a ballot of employees at Walkers site on Stephenson Road, Peterlee.
Two hundred and seven out of the 353 employees voted for the GMB to represent them - with eight against.
The result satisfied the two tests laid down in the statutory recognition laws introduced by Labour in 2000.
A simple majority supported recognition - and it was more than 40 percent of the total bargaining unit.
The vote was organised by the Central Arbitration Committee (CAC) - the quango that adjudicates recognition claims.
The workers to be represented are described as "all individuals who are employed as hourly paid and are located at the Walkers manufacturing site at Peterlee excluding all office staff, frontline management and agency/temporary workers and including engineer (including systems technician); technician (including hygiene technician/lubrication technician); site services operatives (including engineering store men and hygiene PPE), general operatives and quality assistants.
The ballot was required because the CAC was not satisfied more than half of the bargaining unit were union members.
The GMB was formerly the General, Municiple, and Boilermakers union.
There is a report of this case on the CAC website.
This decision follows hot on the heels of the GMB's recognition win at Severn Trent water which was reported on The Workers United.
Other unions should be learning from the GMB's work in the private sector.
Lose a ballot and do two terms as a union general secretary