I would submit a Freedom of Information Act (FOIA) request to whichever government agency you believe has originated the travel restriction. Generally speaking, I have found the State Department adverse to FOIAs. So, the question becomes, why do you think you have a "block" on your passport. If you think the IRS put it there, you could FOIA the IRS. You could attempt to FOIA Interpol.
Feel free to take advantage of our Free 30 Minute Consultation to get the reliable advice you require. You can schedule your appointment by clicking on the BOOK NOW button on our website: www.glinlaw.com and choose Option 1. The link below will also take you to the appointment scheduling system. We would be happy to work with you so that you can make an informed decision on how to proceed.
REVIEW MY CREDENTIALS: http://www.glinlaw.com/MariaGlinsmann.html
REVIEW OUR CONSULTATION INSTRUCTIONS: http://www.glinlaw.com/Consult.htm
SCHEDULE A FREE CONSULTATION: http://www.timecenter.com/glinlawAsk a similar question