My supervisor asked me to come in on my day off for a computer update. I declined. I was sent a venomous 3 paragraph email detailing how "other"s were compliant.Then reamed about other (BS) issues. Including a thinly veiled threat regarding documentation of a few minutes of overtime on the current time sheet.Supervisor is new and has already developed a reputation of management through intimidation.I view this as harassment.As there is no union support... I am taking this to Human Resources. Thinking that bringing a lawyer to the HR could be a good idea.Would that be overdoing it?