what to do if employer did not pay the salary?

[immihelp]

I'm on h1 and when ever i changed jobs i did not get the pay for the last
month that i worked for. This already happend 2 times and i'm not sure
where to report this problem. Can anyone suggest what is to be done?I'm
helpless.

[immihelp]

You can report to Dept. of Labor.