Antitrust law, has three main elements: prohibiting agreements or practices that restrict free trading and competition between business. This includes in particular the repression of free trade caused by cartels. banning abusive behavior by a firm dominating a market, or anti-competitive practices that tend to lead to such a dominant position.

Practices controlled in this way may include predatory pricing, tying, price gouging, refusal to deal, and many others. supervising the mergers and acquisitions of large corporations, including some joint ventures. Transactions that are considered to threaten the competitive process can be prohibited altogether, or approved subject to "remedies" such as an obligation to divest part of the merged business or to offer licenses or access to facilities to enable other businesses to continue competing.
Qualcomm v. Apple. Wherein Qualcomm, the world's biggest maker of mobile chips, alleges in federal court in San Diego, California that Apple violated three of its patents and is suing for tens of millions of dollars.
The European Commission chastises auto part makers and fines two auto-parts manufacturers a total of €368 million ($416 million) after they admitted to coordinating the prices of steering wheels, seat belts and airbags sold to European carmakers over four years.
Anthem v. Cigna. A "stealth" PR campaign allegedly led to the manipulation of and implosion of a potential $ 54 billion merger deal. This plot allegedly even came with the secret hiring of Wachtell Lipton Rosen & Katz LLP under a code name.
Investors accuse Bank of America and Royal Bank of Scotland of attempting to rig the price of sovereign debt issued by European Central Banks.