These motherfuckers

We got forced mandatory overtime to come into work 1.5 hours early today, and then when we got here, we were told they canceled it at 10 am today. They made no attempt to contact us beforehand. Furthermore we were told we could still work if we wanted to, but if we didn't, they weren't going to pay us.

Can they force us, cancel it, not tell us, and then not pay us?

This is in the us. Ohio specifically.