NEW YORK — Coldplay, US comedian Stephen Colbert and veteran British comedian John Cleese will join a star-studded line-up in March for Amnesty International's "Secret Policeman's Ball" benefit gala, organizers announced Wednesday.

The event on March 4 at Radio City Hall in New York will benefit human rights causes, Amnesty International said.

"We are thrilled that some of the most creative political humorists of our time will perform when Amnesty International hosts the first Secret Policeman's Ball in the United States," said Suzanne Nossel, Amnesty International USA's executive director.

"On March 4, those of us who can make fun of our government and walk away in safety will dedicate the program to those who cannot."

The line-up will also feature Jon Stewart, Mumford & Sons, Russell Brand, and Reggie Watts.

"I used to think humor was a luxury, but at the last election Jon Stewart and Stephen Colbert taught me it was a necessity," said John Cleese in a statement.

"The Secret Policeman's Ball was -- and is -- a coming together of the very best comedy talent of any generation to celebrate their art, remind audiences how important free speech is, and highlight just how much vital work Amnesty International does to protect it," Cleese said.