Three Iowans have pleaded guilty in a federal case alleging exploitation of children for child pornography. Prosecutors say 56-year-old Michael Malcom, of Humboldt, was convicted of sexual exploitation of children. He admitted that between 2008 and 2010, he enticed youths under 18 to pose or perform for pornography. Twenty-two-year-old Ashley Prince was convicted of aiding and abetting possession of child pornography. Prosecutors say Prince admitted helping Malcom in producing the porn. Twenty-four-year-old Nikki Fawcett was convicted of interstate transportation with another person for prostitution. Prosecutors say Fawcett admitted that between 2007 and 2009, she drove people across state lines so they could engage in prostitution. Prince and Fawcett are from Fort Dodge. Sentencing dates for the three have not been set.