Hi there,
West Bergholt Brewery started in the latter half of the 19C, extended in 1889 and was taken over in 1958 by Truman, Hanbury and Buxton. It s now a private residence.
This is the only one I could find. Not sure about employment records. Depending on how early in the 1900s you mean, you could try going through the 1901 census of West Bergholt and see who is listed as a brewer or brewer s assistant etc etc. I don t know if you are searching for a specific name. It doesn t guarantee of course that they worked at this particular brewery but it s a start.
Regards
Nimrod