By Noémie Bisserbe 

PARIS--For the past two years Socialist heavyweight Arnaud Montebourg has maintained his position in France's government despite launching periodic attacks on the rightward drift of President François Hollande. On Monday, hours after his latest broadside, Mr. Montebourg was shown the door.

Mr. Hollande dissolved his cabinet and Mr. Montebourg said he wouldn't seek a position in the next team.

Mr. Montebourg's exit highlights the deep divisions within a government facing evaporating popular support and whose policies have so far delivered few results. France's economy is stuck in stagnation and struck by growing unemployment.

His exit--accompanied by that of Education Minister Benoît Hamon and Culture Minister Aurélie Filippetti who also had lambasted Mr. Hollande's austerity drive in recent days--risks leaving the president with a thinning base.

He might also prove a greater threat outside of the government, said Antonio Barroso, a political analyst at Teneo Intelligence.

"The unruly left wing of the Socialists will recover one of their most prominent spokespersons, who at the same time is likely to start positioning himself as a candidate for the 2017 presidential election," Mr. Barroso said.

Mr. Montebourg, who belongs to the left wing of the ruling Socialist Party, was appointed industry minister in May 2012, after his surprise breakthrough to third place in a round of presidential primaries a few months earlier.

A vocal critic of the austerity policies applied across the euro zone in the wake of the sovereign-debt crisis, Mr. Montebourg stood out with his call to impose social and environmental taxes on imports to protect France's jobs and industry.

Mr. Hollande didn't always follow his proposals.

In 2012, Mr. Montebourg threatened to veto PSA Peugeot Citroën SA's plan to close a car-assembly factory near Paris. Months later, he vowed to nationalize ArcelorMittal's French operations when the steelmaker said it wanted to shut down two blast furnaces at Florange in Lorraine, in eastern France.

PSA eventually closed the car plant and ArcelorMittal the furnaces.

In March, however, Mr. Montebourg was given a bigger brief and promoted to economy minister.

He waged a battle to extract concessions from General Electric Co. in exchange for granting the American conglomerate permission to buy most of the assets of French power-and-rail engineering group Alstom SA.

The government gave its green light to GE's purchase but said it would buy a 20% interest in Alstom to ensure what's left of the company remains under French control. It isn't clear whether the government will complete that transaction, now that Mr. Montebourg has left the government.

Mr. Montebourg also amplified his criticisms of the government. In July, he proposed a new road map, calling for supporting household spending through fresh tax cuts.

"My responsibility is to propose new alternatives," Mr. Montebourg said at the time.

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