Megan's Law, which requires information about convicted sex offenders to be public, requires sexual offenders in some states to register and notify their communities of their release.
There are several resources available to those wishing to learn more about child sexual abuse. Both the Rape, Abuse, and Incest National Network (RAINN) and the National Child Abuse Hotline have websites and phone numbers you can call to find out more about this issue or to report a case of abuse.