Hi, the United Nations International Children's Emergency Fund's "mission is to advocate for the protection of children's rights." It would be very interesting to know what the United Nations is doing to protect children's rights.
If we have to look for a renowned institution in human rights around the world, there it is Amnesty International. It has been all around the world denouncing all kinds of human right violations. They are specially interested in crimes against humanity due to war, political unrest, terrorism, hunger, etc.