The facts you present can be considered a Family and Medical Leave Act (FMLA
claim. Specifically, when you go on leave like this you generally are supposed to be returned to the exact of very similar position; absent it being impossible for the employer to return you to that position.
Them putting you on night shift when , a) you weren't working it before the leave, and b) when others are available to do it is fairly strong evidence that the job assignment is because you took the leave...and they very well may be trying to get you to quit.
As your recourse for this, you can file a charge with the Department of Labor
, which will investigate the charge free of cost to yourself and, if it finds retaliation, it may litigate the matter for you if the employer does not willingly comply. If that is something that interests you, I'd suggest you contact the Department of Labor here
to learn how and where to file that charge.
The second option you'd have is to file a private lawsuit, but in your case I'm doubtful you'd find an attorney to take your case because you haven't experienced cash damages yet; you'd have to be fired before an attorney would seriously consider your matter. Thus the Department of Labor is probably your best and only option at this time.
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