There's no shortage of information available on these fake charities. Just Google "Operation Underground Railroad scam" or read this free article:
EDITOR’S NOTEBOOK: “Sound of Freedom” Doesn’t Tell True Story of Operation Underground Railroad – MinistryWatch
These charities claim that between 300,000 to 800,000 children are kidnapped and exploited each year in the US. The actual number is about 100.
We're way off topic but the important thing to know is that most child sex exploitation occurs when someone known to the child (i.e. a relative, a trusted friend) gains the trust of the family and exploits the child. There is no large scale kidnapping ring. There is no network of people drinking the blood of children.
People who profit off a problem that doesn't exist aren't running a charity. They are running a grift.
These charities are collecting millions of dollars in fundraising to "Save the Children". If there is not a problem with hundreds of thousands of children being kidnapped, then where is the money going?