You can check on the legitimacy of an organisation by clicking on its 'Affiliates', 'Funding' or 'Organisations that support us'. If any of these name George Soros, Open Society, Amnesty, Bill and Melinda Gates, WHO, HRW, UN, UNESCO, it's dirty. If it doesn't support anti-trafficking legislation and its says that child sex workers and vulnerable women are 'empowered' by legalised or decriminalised prostitution, it's not legitimate. It is known that the only way to curb sex trafficking is by ending demand. Decriminalisation and legalisation of brothel owners, pimps & sex buyers increase trafficking. The majority of sex trafficked women are lured into prostitution from third world countries like Romania, the Ukraine and Asia into first world countries with decriminalised prostitution such as Netherlands and Germany, where there are not enough local women to fill demand and crime gangs traffic young girls who are then kept in debt bondage, their passports confiscated and their families' lives threatened.

Those organisations not seeking to end demand are not serious; in fact, I'd go so far as to say that some of them may be profiting from trafficking (as proven in Italy when it was found that George Soros's NGO had been in communication with traffickers). Assume that any NGO set up by George Soros is dirty.

Any group that supports the Nordic Model of prostitution and seeks to end demand is legitimate.

https://www.equalitynow.org/sites/default/files/Nordic%20Model%20Fact%20Sheet_0.pdf