Explaining that the deferential standard of review is appropriate because the "[the ALJ] ... sees the witnesses and hears them testify, while the Board and the reviewing court look only at cold records"
Holding that union could not expel member because he filed unfair labor practice charge against it without first exhausting internal remedies as provided in union constitution
Holding that protection from retaliation for "fil[ing] charges or giv[ing] testimony" under the National Labor Relations Act extends to an employee who gave a written sworn statement to an NLRB examiner
Upholding Board's determination that discharge for insubordination was pretextual where employer "refused to discharge" another employee also accused of insubordination
Holding that "due process is satisfied when a complaint gives a respondent fair notice . . . and when the conduct implicated in the alleged violation has been fully and fairly litigated"