The sole question presented by this case is whether an order of the Wisconsin Employment Relations Board entered under the Wisconsin Employment Peace Act, L.1939, ch. 57, Wis.Stat.1939, ch. 111, pp. 1610-1618, is unconstitutional and void as being repugnant to the provisions of the National Labor Relations Act. 49 Stat. 449, 29 U.S.C. § 151 et seq.
Sec. 111.06(2) of the state Act provides in part:
'It shall be an unfair labor practice for an employe individually or in concert with others:
'(a) To coerce or intimidate an employe in the enjoyment of his legal rights, including those guaranteed in section 111.04, or to intimidate his family, picket his domicile, or injure the person or property of such employe or his family.
'(f) To hinder or prevent, by mass picketing, threats, intimidation, force or coercion of any kind the pursuit of any lawful work or employment, or to obstruct or interfere with entrance to or egress from any place of employment, or to obstruct or interfere with free and uninterrupted use of public roads, streets, highways, railways, airports, or other ways of travel or conveyance.'
The state Board is given authority on the filing of a complaint to conduct hearings, to make findings of fact, and to issue orders. § 111.07. Orders of the state Board are enforceable by the circuit courts. Id. Appellee, Allen-Bradley Co., is engaged in the manufacturing business in Wisconsin. Appellant union is a labor organization composed of the employees of that company. The union had a contract with the company governing terms and conditions of employment. The contract was cancelled by the union. Thereafter the union by secret ballot ordered a strike, which was called on May 11, 1939. The strike lasted about three months during which time the company continued to operate its plant. Differences arose between the employees who were on strike and the company and those employees who continued to work. The company thereupon filed a petition with the state Board charging the union and certain of its officers and members with unfair labor practices. The union answered and objected, inter alia, to the jurisdiction of the state Board on the ground that as respects the matters in controversy the company was subject exclusively to the provisions of the National Labor Relations Act and to the exclusive jurisdiction of the federal Board. The state Board made findings of fact and entered an order against the union and its officers and members. On a petition for review, the circuit court sustained and enforced the Board's order. The Supreme Court of Wisconsin affirmed that judgment. 237 Wis. 164, 295 N.W. 791. The case is here on appeal. Judicial Code, § 237(a), 28 U.S.C. § 344(a), 28 U.S.C.A. § 344(a).
The findings and order of the state Board as summarized by the Supreme Court (237 Wis. pages 168-170, 295 N.W. page 793) are as follows:
'Briefly, from the findings the following facts appear:
'(a) Appellants engaged in mass picketing at all entrances to the premises of the company for the purpose of hindering and preventing the pursuit of lawful work and employment by employees who desired to work.
'(b) They obstructed and interfered with the entrance to and egress from the factory and obstructed and interfered with the free and uninterrupted use of the streets and sidewalks surrounding the factory.
'(c) They threatened bodily injury and property damage to many of the employees who desired to continue their employment.
'(d) They required of persons desiring to enter the factory, to first obtain passes from the union. Persons holding such passes were admitted without interference.
'(e) They picketed the homes of employees who continued in the employment of the company.
'(f) That the union by its officers and many of its members injured the persons and property of employees who desired to continue their employment.
'(g) That the fourteen individual appellants, who were striking employees, had engaged in various acts of misconduct. The facts relating to those were found specifically. The acts consisted of intimidating and preventing employees from pursuing their work by threats, coercion, and assault; by damaging property of employees who continued to work; and as to one of them by carrying concrete rocks which he intended to use to intimidate employees who desired to work.
'Based upon these findings the Board found as conclusions of law, that the union was guilty of unfair labor practices in the following respects:
'(a) Mass picketing for the purpose of hindering and preventing the pursuit of lawful work.
'(b) Threatening employees desiring to work with bodily injury and injury to their property.
