Bus, metro and tram workers in Athens have been staging a 24-hour strike in the latest in a series of almost daily walkouts and demonstrations against cost-cutting reforms in the transport sector.
The reforms are designed to reduce expenditure and waste at Greece's loss-making public transport companies, but workers fear they will erode their rights.
They have planned a demonstration outside Parliament, when politicians will be discussing and voting on the Bill.
Public transport ticket prices were increased by up to 80% earlier this month.
Greece avoided bankruptcy last year through a 110 billion euro (£92.6 billion) international rescue loan package. In return, the Socialist government implemented unpopular austerity measures.