The opinion
Mr. Justice Harlan,
whom Mr. Justice Stewart joins,
concurring.
I join the Court’s opinion on the basis of the reasoning set forth in my concurring opinions in No. 68, ante, p. 656, and in Nos. 64 and 85, ante, p. 677.
Here, as with respect to the “hiring hall” clause in Nos. 64 and 85, I think the Board’s finding that the “General Laws” clause “encouraged” union membership must be accepted. I need only add that in light of the *704 historic use of such clauses to maintain closed-shop conditions, I would not be willing to overrule the Board’s determination that those employed or seeking employment in this newspaper’s mail room would regard the innocently worded incorporation of the union’s valid “General Laws” as in fact evidencing the employer’s and union’s intent to allow forbidden union bylaws to govern their relationship as regards employment, until a finding of an unfair labor practice arising therefrom had actually been made.