A bill to amend section 8(b) (4) of the National Labor Relations Act, as amended, with respect to strike at the sites of construction projects.

Provides, under the National Labor Relations Act, that the provisions of such Act making it an unfair labor practice for a labor organization to force or require, by striking, specified employers to recognize a non-certified labor organization, shall not be construed to forbid any strike at a construction site which is directed at any of several employers who are in the construction industry and are jointly engaged as joint venturers or in the relationship of contractors and subcontractors, provided there is a lawful labor dispute and the issues in such dispute do not involve a labor organization which is representing the employees of an employer at the site who is not engaged primarily in the construction industry.

Requires prior written notice of intent to strike or refusal to perform services in the case of any military site if a major purpose of such facility is, or will be, the development, production, and testing of various weapons.