They don't seem to be an ethnic group so much as a marginalized social class, but some have suggested a connection with the word "Hebrew."

他们并不像是少数民族,而更像是边缘化的社会阶级，但有些人指出它与希伯来这个词有关联“

耶鲁公开课 - 旧约导论课程节选

There it had less to do often with social forms of reform although that's not entirely true than it had to do with the Civil Rights revolution and the Vietnam War.

通常来说,它与改革的社会形态关联较小,但是它与民权革命和越战的关系,也没有人们认为的那么紧密

耶鲁公开课 - 美国内战与重建课程节选