Dixie Chicks lead singer Natalie Maines has never been shy about expressing her opinions in public, and she took to Twitter to express her outrage after Sony pulled the plug on Seth Rogen's new movie, 'The Interview.'

Maines called the company "cowards" in the wake of the decision, which came after North Korea hacked into Sony's mainframe and publicly released a series of embarrassing emails in retaliation for the satirical film, which depicts a plot to assassinate North Korean leader Kim Jong Un. The FBI has confirmed the hacks came from the North Koreans, who have denied involvement. Sony subsequently received email threats of unspecified violence if the film was shown in public in any form, and have so far stood by their decision not to release it.

There's no love lost between Maines and Sony after the Dixie Chicks filed suit against the company in 2001, accusing Sony of "systematic thievery" over unpaid royalties. That suit resulted in the group striking a new deal that included a $20 million signing bonus.

The outspoken singer added her voice to that of many artists who have denounced Sony's decision over 'The Interview' as bowing to unsubstantiated terrorist threats, expressing her displeasure in a series of tweets on Thursday (Dec. 18).

She added, "Well while they're caving, I wish the terrorists would tell Sony to release Natalie Maines or else!"

Maines released her first solo album, 'Mother,' in May of 2013 via Columbia Records, a subsidiary of Sony Music.

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