UNFPA has been falsely accused by anti-family planning groups of providing support for government programs which have promoted forced-abortions and coercive <answer>sterilizations</answer>. Controversies regarding these claims have resulted in a sometimes shaky relationship between the organization and three presidential administrations, that of Ronald Reagan, George H. W. Bush and George W. Bush, withholding funding from the UNFPA.  
UNFPA has been accused of supporting programs that coerce what?
sterilizations