Bryan Simpson, national lead for hospitality at Unite, said: “For Brewdog to give loyal workers less than four days notice of the closure of their workplace is not just morally repugnant, it is potentially unlawful.
“This is yet another example of a company that doesn’t have the slightest regard for basic employment law let alone the welfare of their workers.
“We are currently supporting our members across these 10 sites to collectively challenge these redundancies, and we would urge anyone impacted to reach out to us for legal support.”
Brewdog said a 14-day consultation process would be carried out for all staff at risk of redundancy.
The company would not disclose the number of employees affected and told BBC Scotland News its focus was on redeployment.
The company is known for its craft beers and IPAs and has breweries and pubs across the globe, including 71 in the the UK, of which 17 are in Scotland.
It also has bars in Dubai, the USA and Australia.