We currently do not have a feature that lets you hide your resume from certain employers. We definitely understand the desire to hide your resume from certain employers though, and we are looking into a good solution.
If you would like to change the visibility of your resume, log into your account here.
To the right of your resume, you'll see options to make your resume public or private.
Public resumes are visible to anyone, however, your phone number and email address are provided only to employers to whom you apply. Your street address and postal code are visible only to you.
Private resumes are not visible (and employers cannot find you). When you set your resume to Private, it does not appear in the search results, but you will still be able to use it to apply for jobs with the Apply Now button.