Upholding Board's determination that discharge for insubordination was pretextual where employer "refused to discharge" another employee also accused of insubordination
In N.L.R.B. v. Marshall Car Wheel Foundry Co., 218 F.2d 409, 411 (5th Cir. 1955) cited by respondents, the planned employee walkout held to be unprotected occurred at the moment molten iron was ready to be poured and this action "might well have resulted in substantial property damage" to the plant.