Updated

The Justice Department is expected to oust the head of the Bureau of Alcohol, Tobacco, Firearms and Explosives, according to people familiar with the matter, amid a troubled federal antitrafficking operation that has grown into the agency's biggest scandal in nearly two decades.

Moves toward the replacement of Kenneth Melson, acting ATF director since April 2009, could begin next week, although the precise sequence of events remains to be decided, these people said.

The shakeup shows the extent of the political damage caused by the gun-trafficking operation called Fast and Furious, which used tactics that allowed suspected smugglers to buy large numbers of firearms. Growing controversy over the program has paralyzed a long-beleaguered agency buffeted by partisan battles. The ATF has been without a Senate-confirmed director since 2006, with both the Bush and Obama administrations unable to overcome opposition from gun-rights groups to win approval of nominees.

In November, President Barack Obama nominated Andrew Traver, the head of the ATF's Chicago office, as permanent ATF director. The nomination stalled in the Senate after the National Rifle Association said Traver had a "demonstrated hostility" to the rights of gun owners.

Traver is set to travel to Washington on Tuesday to meet with Attorney General Eric Holder and Deputy Attorney General James Cole, the people said. The administration is weighing whether to name Traver as acting director or choose another interim chief while awaiting Senate action on his nomination, they said.

To read more see The Wall St. Journal article here.