French Prime Minister Manuel Valls said on Wednesday the government would not back down on its contested labor reforms and urged the hardline CGT union to stop organizing mass rallies against them in Paris after violence at demos on Tuesday.

"We cannot have a general ban (on demos), but we will take our responsibilities," Valls said on France Inter radio a day after gangs of masked youth clashed with riot police during a march in Paris.

"We can no longer have this disgraceful show with things getting out of control," Valls added.