Well, they're obligated to prevent the accuser from losing their job from making the accusation. The accuser probably wants more than that, however. My unders

Well, they're obligated to prevent the accuser from losing their job from making the accusation. The accuser probably wants more than that, however. My understanding is that in many countries other than the US unions are legally allowed to do the sort of self-policing of their members that would help in this case. The law exists because historically many non-socialist unions in the US formed part of the bulwark of segregation and had to be prevented from finding ways to kick non-white members out.