John Marshall Harlan II,
Hanna Mining Company v. District 2…
“ However, even assuming that § 14 (a) itself intended also to make it clear that state law could not prohibit supervisors from joining unions, the section would have no application to the present facts; for picketing by a minority union to extract recognition by force of such pressures is decidedly not a sine qua non of collective bargaining, as indeed its limitation by § 8 (b) (7) in nonsupervisor situations attests. ”
