The Yellow Dog Contract Was a Device Used by Anti-Union

The yellow dog contract was a device used by anti-union employers to stop the progress of the union movement by forcing a worker to promise not to join a labor union while in the hire of an employer.

A) Yellow dog contracts were made illegal by court decision in Hitchman Coal Company v.Mitchell.
B) the Norris-LaGuardia Act declared that yellow dog contracts were inconsistent with U.S.public policy and not enforceable in any court in the United States.
C) the Wagner Act declared that yellow dog contracts were inconsistent with U.S.public policy and not enforceable in any court in the United States.
D) the Taft-Hartley Act declared that yellow dog contracts were inconsistent with U.S.public policy and not enforceable in any court in the United States.