A bill aimed at banning tech giants like Amazon.com Inc (NASDAQ:AMZN) and Alphabet Inc (NASDAQ:GOOG)'s Google from abusing their market dominance was backed by the United States' Department of Justice (DOJ), the first fully-fledged support from the Biden administration for an anti-trust measure. The DOJ accused large digital platforms of being a threat to open markets, abusing their monopolies, squeezing profits from competitors and posing a risk to consumers by anti-competitive practices, The Wall Street Journal reported, quoting a letter from Peter Hyun, acting assistant attorney general for legislative affairs for the department.