This is actually in violation with Mturks TOS. You cannot ask for personally identifiable information. They could ban your Amazon account.
really? oh man, those TOS are killing me. let me check that... thanks for telling me!
You could ask people to remove personally identifiable information (names, phones, etc.) and inform them that if they'd like to upload their full resume, they're welcome to at the full site.
yeah, that sounds like a much better approach even. thanks man!