ABC test

What does ABC test mean in American Law?

The definition of ABC test in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

A test for whether an employer is covered by workman’s compensation law: If the persons he employes are (a) free of his control; (b) work away from his place of business; and (c) are customarily engaged in independent trades or professions, there is no coverage.