Smokeandsteam
Working Class First
Just look at the victory of the PCS strikers at the National Gallery. That was a product of the combination of their own sacrifice and solidarity, together with (what they acknowledge has been) the shift in the political mood born out of the scale of Corbyn's support.
The jobs have been outsourced so it's an odd victory in a dispute over privatisation (although I believe the sacked shop steward there won reinstatement which is good but nothing to do with Corbyn).