What evidence exists that the carpenters union intended to exert pressure on the neutral or secondary employer in this case, Whilhelm Construction Co?

The carpenters union did not clarify its intent to limit the picket call to off-duty employees. Instead it made an unconditional request that all of its members, including Wilhelm workers, help staff the picket line being organized against Dailey. Moreover, the Union distributed a card to its members before the picket line that stated "GOOD UNION BUILDING TRADESMEN do not work behind banners even with 4 gates," thereby implicitly calling on its members who worked for secondary employers to join any strike that might take place at the construction site. The card also stated that the Union could not advise its members what to do, but any member reading the card would likely interpret its overall effect as "a wink and a nod" to join the strike when it was called.