The DOJ sued to stop the merger of AT&T and Time Warner (DOJ lost). The DOJ sued to stop the merger of T-Mobile and AT&T when they tried a few years back (AT&T

The DOJ sued to stop the merger of AT&T and Time Warner (DOJ lost). The DOJ sued to stop the merger of T-Mobile and AT&T when they tried a few years back (AT&T backed down). It also sued to stop the merger of T-Mobile and Sprint (DOJ settled).