Employment Law Questions? Ask an Employment Lawyer.
Unfortunately, unless you have evidence suggesting that the basis for this treatment was your race, religion, gender, age, disability or recent FMLA use, there isn't any legal steps that you can take to correct the boss's behavior because it is not illegal in employment law.
Your recourse, if any, will lie entirely in any grievance procedures that your employer itself has in place.
If you are referring to the employer's disciplinary actions, then yes. If the employer has an internal grievance, complaint or disciplinary process, you have to address this issue through that internal program.
Again, the harassment that you speak of (without an allegation of discrimination based on one of the factors I mentioned) is not itself illegal, so no outside agency will handle the matter and it is left to your employer to handle the situation as they see fit.