放狗的一位同学补充了一道不是GWD中的题!~ 4. 新题目 Yet it can be argued that through contracts negotiated and enforced by White union members, unions—CIO unions not excluded—were often instrumental in maintaining the occupational segregation and other forms of racial discrimination that kept African Americans socially and economically oppressed during this period 问上面这段文章中,提到白人contracts negotiated 是为了说明什么?