My son, a nursing home kitchen aid, was fired over false accusations from fellow employees.

My son was fired from his job over accusatios that he threw a "head fit", broke dishes, and threatened fellow employees.
Management claims there are four witnesses.
My son claims no knowledge of these events, was not questioned during any investigation (nor has any knowledge that an investigation actually occured, and has had HR issues with the administrator only two months prior.
Also, this was handled poorly, fellow employees were aware of his termination and the alledged reasons why, before he was told. He was never allowed to see the accusations against him, nor offered the opportunity to defend himself. He was not informed of his termination until he reported for work, where he was turned away at the door and offered a police escort to leave.
Can we do anything?