关于破折号的作用

dkswoah

Yet the AFL's voluntarism had accommodated certain exceptions: the AFL had supported government intervention on behalf of injured workers and child laborers. AFL officials drew the line at national health insurance, however, partly out of concern for their own power. The fact that AFL outsiders such as the AALL had taken the most prominent advocacy roles antagonized Gompers. That this reform threatened union-———————— sponsored benefit programs championed by Gompers made national health insurance even more objectionable.


想问一下这个破折号是什么作用啊   后面sponsored benefit.... 是指这个union  是被GOMPER支持的  对么      那made是说这个union让国家健康保险令人反感  还是说 改革威胁union这个事使国家保险反感啊？   
划线部分求个翻译   谢谢了