Sentence:  As the more conservative group with strong backing from wealthy businessmen , the U.M.C.I.A. was generally favored against the more progressive , <WSD>labor</WSD> based U.N.F.P. The newer party campaigned heavily , while the older , more confident party expected the Moroccan merchants and small businessmen to support them as they had done for many years . 
Meaning of the word marked with <WSD> tags:  a social class comprising those who do manual labor or work for wages