AT&T Suit Follows Antitrust Tactics With Oracle, H&R Block

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AT&T Inc.’s proposed $39 billion takeover of T-Mobile USA Inc. is one of the rare instances where the U.S. Justice Department in recent years has actively sought to block a merger through a lawsuit or an informal threat to sue, based on antitrust grounds.

What follows are some examples of department efforts to block acquisitions and their outcomes: