The All Blacks squad led a training session at a maximum security prison in Buenos Aires, Argentina with around 60 inmates from the facility's Spartans rugby club.
The New Zealand side gave the prison team a signed shirt and performed a haka.
"For us as people, its our responsibility to help people who are less fortunate then ourselves and thats what is happening here," Sonny Bill Williams said.
The All Blacks play Argentina in a Rugby Championship Test match on Sunday.
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