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Unfortunately, there is no way to just wipe your information from every site in a single move. Each site maintains its own information... so you would have to contact each site and ask that it be removed. In this case, if they are stating that you are a registered sex offender, that is untrue information. So you would be within the law to threaten them with a defamation lawsuit if they do not remove the false information.
If the sites say something true, like you were convicted of a certain crime... they don't have to remove that information.
The botXXXXX XXXXXne is that you will have to contact the site administrator for each site where the information is contained and ask them to remove it.