The gendarmes raided the Lidl logistics platform in Ploumagoar (Côtes-d'Armor), near Guingamp, on Tuesday morning, as part of an investigation for union discrimination, AFP learned.
Several people were taken into police custody.
"This [Tuesday] morning, around 9:00 am, around 25 gendarmes went to the Guingamp logistics platform to take all of our local management team into custody on grounds of union discrimination," said a spokesperson for the hard-discount sign at the press agency.
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The spokesperson expressed the shock of "employees present and witnesses to the scene".
Employees of the neighboring Rennes platform "came to support them and set up a psychological unit," she continued, specifying that the activity in the Ploumagoar warehouse was however maintained.
She could not specify the number of people placed in police custody and the Saint-Brieuc prosecutor's office, contacted by AFP, did not want to comment.
According to Ouest France, the regional director and a dozen of his employees were taken to the gendarmerie.
Many cases involved
Arnaud Rouxel, CGT union delegate on the site, explained to AFP that it was a "fairly important file in terms of cases".
"We alerted the prosecutor at the end of July, explaining to him the atmosphere, the deterioration of working conditions, the employees punished in a discriminatory manner, the pressures on the right to strike," he told AFP , evoking a "toxic management, adrift".
According to him, acts of harassment were also reported.
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Arnaud Rouxel himself filed a complaint for trade union discrimination, like several other employees.
According to the daily Ouest France, the search is seen as a relief by many employees as the situation had become deleterious.