JUSTICE BLACKMUN delivered the opinion of the Court.
In this case, we must examine the concepts of "major" and "minor" disputes in the area of railway labor relations, articulate a standard for differentiating between the two, and apply that standard to a drug-testing dispute.
I
Since its formation in 1976, petitioner Consolidated Rail Corporation (Conrail), has required its employees to undergo physical examinations periodically and upon return...
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