I am no expert on this subject but if they were employed above board and taxes and such deducted from their paychecks; I would gather my pay stubs and go to the unemployment office with them. They may be able to go after this contractor. Whatever you do DO NOT give up your original pay stubs !! They are your only proof.Might even try talking with the local licensing department.
If they were not having taxes and such held back from their paychecks they may have been listed as sub-contractors and then the tax burden is theirs , and they may not qualify for unemployment.
You are still working there- correct ? You might want to look into this also, Don't want to wish ill harm , but what if you found yourself in the same boat ?