Proper noun
UMWA
Initialism of United Mine Workers of America.
Umwa
A village on Banaba, Kiribati.
In what a contemporary writer pointed out was a complete reversal of their usual policy, UMWA officials called for police to protect United Mine Workers members who wished to cross the picket lines. Source: Internet
The IWW considered the UMWA too reactionary, because the United Mine Workers negotiated contracts with the mine owners for fixed time periods; the IWW considered that contracts hindered their revolutionary goals. Source: Internet