Hong Kong (CNN) A day after organizers said 2 million Hong Kongers took to the streets to march against an extradition bill with China, one of the city's pro-democracy icons has been released from prison.

Joshua Wong walked free Monday after serving one month of a two month sentence related to protests in 2014.

Hello world and hello freedom. I have just been released from prison. GO HONG KONG!! Withdraw the extradition bill. Carrie Lam step down. Drop all political prosecutions! — Joshua Wong 黃之鋒 (@joshuawongcf) June 17, 2019

"It's really good timing to join the fight for freedom and democracy," he told CNN after his release. "Five years ago after the end of the Umbrella Movement, we claimed we would be back. Yesterday 2 million people came to the streets ... it shows Hong Kong people realize this is a long term battle."

Wong echoed protesters' calls for the city's Beijing-backed leader to resign.

"Why did Carrie Lam need to wait to suspend the bill until 1 million people came to the streets, it's because she's not elected by the people of Hong Kong," he said. "It's time for her to step down."

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