What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". Your task is to determine what category of business best describes the area of activity of this litigant which is involved in this case.

Opinion:
MARYLAND CASUALTY CO. v. RUTHERFORD et al.
Circuit Court of Appeals, Fifth Circuit.
November 26, 1929.
No. 5702.
E. H. Foster, Julius Dorenfield, Jr., and John R. Fullingim, all of Amarillo, Tex., for appellant.
James O. Cade, of Amarillo, Tex., for appellees.
Before WALKER and BRYAN, Circuit Judges, and DAWKINS, District Judge.
BRYAN, Circuit Judge.
This was an action by the widow and minor children of Ralph J. Rutherford on a policy of insurance issued by appellant. The policy was taken out and the premium thereon was paid by the city of Hereford, Tex., and included insurance against loss resulting from death or accident to its policemen, to the full extent that compensation and other benefits were provided for injury or death of employees by the Texas Workmen’s Compensation Act (Rev. St. 1925, arts. 8306-8309). The petition alleged that Rutherford was an employee, and also that he was a policeman. The answer denied that he was an employee, but admitted that he was a policeman.
In Texas it has been held by the Supreme Court that a policeman is a state officer, and not a city employee, Yett v. Cook, 115 Tex. 205, 281 S. W. 837; and that a city of Texas is without power to bind itself as an employer under the Compensation Act, Southern Casualty Co. v. Morgan (Tex. Com. App.) 12 S.W.(2d) 200. But in the last-cited ease it was further held that a city employee was entitled to recover from an insurer, who had collected the premiums and had contracted to provide insurance for city employees, according to the terms of the Compensation Act, and we see no reason why that decision is not in point here. In this case the city of Hereford did not undertake to become a subscriber under the Compensation Act, as did the city of Weatherford in the Morgan Case, and so far as appears acted within its charter powers in taking out insurance to protect its officers, in whom it had an insurable interest. At all events, appellant received a premium as consideration for its obligation to insure; and the contract of insurance was an executed one, was not unlawful, or opposed to public policy. Appellant had the right to enter into the insurance contract on terms satisfactory to it, and could measure its liability by adopting by reference applicable provisions of the Compensation Act, just as effectively as it could bind itself by setting out those provisions at length in the policy itself.
The judgment is affirmed.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". What category of business best describes the area of activity of this litigant which is involved in this case?

Choices:
agriculture
mining
construction
manufacturing
transportation
trade
financial institution
utilities
other
unclear

Answer: 6