Source: United States Department of Justice (video statements)
Today, the Justice Department filed a civil antitrust lawsuit against Visa for monopolization and other unlawful conduct in debit network markets in violation of Sections 1 and 2 of the Sherman Act. Filed in the U.S. District Court for the Southern District of New York, the complaint alleges that Visa illegally maintains a monopoly over debit network markets by using its dominance to thwart the growth of its existing competitors and prevent others from developing new and innovative alternatives.
Related:
https://www.justice.gov/opa/pr/justice-department-sues-visa-monopolizing-debit-markets
https://www.justice.gov/opa/speech/principal-deputy-associate-attorney-general-benjamin-c-mizer-delivers-remarks-justice-0
https://www.justice.gov/opa/speech/attorney-general-merrick-b-garland-delivers-remarks-justice-departments-lawsuit-0
https://www.justice.gov/opa/speech/principal-deputy-assistant-attorney-general-doha-mekki-delivers-remarks-justice-0