Greeks took to the streets on Wednesday to protest a controversial plan over amending the country's labor law.

Iran PressEurope: Greece was hit by strikes Wednesday for the second time in a week and protesters took to the streets over a controversial labor reform expected to be approved by parliament later in the day.

No ferry services to Greek tourist islands were available and urban transport in the capital was disrupted by the 24-hour walkout.

Police said more than 7,000 people demonstrated against the bill in Athens on Wednesday morning, and around 8,000 were gathered outside parliament in the early evening.

Greek Prime Minister Kyriakos Mitsotakis said the "deeply pro-growth" reform aligns the country with "fast-paced" European standards and brings "transparency" to union processes.

One in four workers in Greece today is undeclared or partially declared to labor authorities, the prime minister said.

But communist party leader Dimitris Koutsoumbas said the new system legalizes a workplace "jungle" where employees will be "totally defenceless".

And opposition leader Alexis Tsipras denounced the law as a "return to the Middle Ages", saying: "This bill means working more for less pay and without (job) security."

Public services were also shut in opposition to the new law, which promotes working hour flexibility and sets tougher rules on strikes.

The government says the reform introduces optional working hour flexibility, sets rules on remote work, improves parental leave and includes safeguards against workplace sexual harassment.

A working day of up to 10 hours is permitted under the reform. 219