Answer:
Those parties agree to restrain competition
Explanation:
Sherman Antitrust Act of 1980 deals specifically about the regulation of competitions among enterprises. It was principally authored or engineered by Senator John Sherman, under President Benjamin Harrison, hence, the name Sherman Act.
Sherman Antitrust Act which is divided into three section, has its first section which is section 1 worded as:
"Every contract, combination in the form of trust or otherwise, or conspiracy, in restraint of trade or commerce among the several States, or with foreign nations, is declared to be illegal."
The main purpose of this, is to forbid or make illegal any anticompetition practices.