“ It is therefore evident that not all types of obligations due employees from their employers are regarded by Congress as being within the concept of wages, even though having some relation to employment. Moreover, such action indicated the care Congress has exercised in regard to the protection it has granted 'wages * * * due to workmen.'
Let us examine the nature of these contributions. They are flat sums of $8 per month for each workman. ”

“ Furthermore, if the claims of the trustees are to be treated on a par with wages, in a case where the employer's assets are insufficient to pay all in the second priority, the workman will have to share with the walfare plan, thus reducing his own recovery.
Respondents argue that precedent allows the priority to be asserted by one other than the workman himself. ”

“ A workman cannot even compel payment by a defaulting employer. Moreover it does not appear that the parties to the collective agreement considered these welfare payments as wages. The contract here refers to them as 'contributions.' Finally, Embassy's obligation is to contribute sums to the trustees, not to its workmen; it is enforceable only by the trustees who enjoy not only the sole title, but the exclusive management of the funds. ”