[求助]白勇第四页题目翻译

Where once the union had acquiesced to the prejudices of its English-speaking members by supporting the imposition of an alien tax on immigrant workers, after 1897 the United Mine Workers made a determined effort to enlist Italians and Slavs in its ranks.

答案能选出来，可是题目看不明白。请大家帮忙翻译一下。

一个月了也没人理。

English-speaking members 与Italians and Slavs 是什么关系啊？