For the simple reason, Foremen have been ruled to be MANAGEMENT since before WWII, in fact as part of the 1947 Taft-Hartley Act, Foremen were FORBIDDEN to from any type of union for themselves. The name is NOT important, the issue is do they have ANY supervisory powers? If NONE (and I mean NONE) then they are NOT management, but if they just tell the other employees what to do, and the other employees MUST listen to them, even if a third person makes any decision as to being terminated, that role is still management.
I give a military example, even a Corporal is part of the Command Structure of the Military, this he or she is a Manager. I suspect these "Supervisors" have no more power than a Corporal, but that is enough to be part of Management.
This can be seen in 29 USC § 152 (11), Definitions:
(11) The term “supervisor” means any individual having authority, in the interest of the employer, to hire, transfer, suspend, lay off, recall, promote, discharge, assign, reward, or discipline other employees, or responsibly to direct them, or to adjust their grievances, or effectively to recommend such action, if in connection with the foregoing the exercise of such authority is not of a merely routine or clerical nature, but requires the use of independent judgment.Notice the term "responsibly to direct them" and the connector "or". Thus if anyone does ANY of the above, that person is a supervisor under the National Labor Relations Act. Thus if all the people do is Direct other employees, they are Supervisors.
For 29 USC § 152:
http://www4.law.cornell.edu/uscode/html/uscode29/usc_sec_29_00000152----000-.htmlFor the rest of the National Labor Relations Act (As amended) see:
http://www4.law.cornell.edu/uscode/html/uscode29/usc_sup_01_29_10_7_20_II.html