is it illegal to video and/or audio record someone in the state of mass without there knowledge
Real Estate Attorney
It is a misdemeanor to record someone's voice without their permission in the Commonwealth of Massachusetts. So long as you are not invading someone's privacy in order to capture them on video, it is not necessary to have their permission.
Employment / Labor Attorney
It is a crime to audiotape someone without their consent. There is no general prohibition against videotaping, but could subject you to at least civil liability if you were to videotape someone in private without their consent.