The Massachusetts Sex Offender Registry Board maintains a website of Level 3 sex offenders, and Level 2 sex offenders classified after July 12, 2013. The website allows members of the public to identify sex offenders living, working, or attending an institution of higher learning in the Commonwealth. The public can also obtain information on Level 2 and 3 offenders at their local police department, or by contacting the SORB directly.
https://www.mass.gov/orgs/sex-offender-registry-board