Most of these laws can be found by googling the citation, or you can visit your local law library to find them (see Law Libraries under RESOURCE LINKS)

MA General Laws Table of Contents:  http://www.mass.gov/legis/laws/mgl/gl-pt1-toc.htm

MA General Laws - Chapter 23: Department of Labor & Workforce Development: 
http://www.mass.gov/legis/laws/mgl/gl-23-toc.htm 

Mass. Gen. Laws Ann. ch. 149, Section 100 - Employee Meal Breaks:  "No person shall be required to work for more than six hours during a calendar day without an interval of at least thirty minutes for a meal. Any employer, superintendent, overseer or agent who violates this section shall be punished by a fine of not less than three hundred nor more than six hundred dollars."   

Mass. Gen. Laws Ann. ch. 149, Section 148A - Wage & Hour Law:  "No employee shall be penalized by an employer in any way as a result of any action on the part of an employee to seek his or her rights under the wages and hours provisions of this chapter.  Any employer who discharges or in any other manner discriminates against any employee because such employee has made a complaint to the attorney general or any other person, or assists the attorney general in any investigation under this chapter, or has instituted, or caused to be instituted any proceeding under or related to this chapter, or has testified or is about to testify in any such proceedings, shall have violated this section and shall be punished or shall be subject to a civil citation or order as provided in section 27C."