Italy's main union, the CGIL, has called a four-hour general strike that will include transport workers.
Trains, planes, ferries and local bus, subway and tram service are expected to be affected.
The union is protesting what it says is a too heavy tax burden on workers, given widespread tax evasion in Italy by those who are self-employed.
It also wants more protection for workers who only have temporary contracts. Also irking labour leaders are changes in how the firing of workers can be challenged under Italy's labor laws.