pregnancy, hazardous duty, uncompensated training, etc... class action guidance requested

I will address each of your concerns by number that corresponds with the number you used. 1.  The law requires employers with 15 or more employees to not discriminate against pregnant employees.  However, the law does not require employers to treat pregnant employees better than non-pregnant employees. If an employer expects a non-pregnant employee to perform duties as part of the job, it can lawfully require a pregnant employee to perform the same.   2.  If you are over the age of 17, you can be required to work in unpleasant conditions.  Employers are not required to pay "hazard" pay.   3.  If employees are performing any work, including training, at the direction of the employer, the employee must be compensated for it if the employee is a non-exempt employee.   4.  In general, employers cannot require an employee to submit to a polygraph except in limited circumstances if there is an incident that led to an economic loss and there is reasonable suspicion the employee has caused the loss.  You can lawfully record any conversation you are a part of, but the employer can lawfully terminate you for such recording.   5.  The government may be interested in the employer's hiring practices if they are in violation of our immigration and work laws, but it does not allow you to make a legal claim for it.   6.  I see no "class action" claim in these facts.