The wife needs to tell her plight to anyone and everyone who listens but without aggravating her husband.
The friend on the other hand should go to all the authority figures in the world to get them to take action against the husband.
In real terms - there should already be a case files against YAHOO at the ICC. Even if it amounts to nothing, there will be a lot of press out there against him. Then constantly raise the issue at UN, UNHRC, etc.
South Africa got rid of apartheid not because of the goodness in the white man's heart but because of INTL pressure.