Robert Kraft, owner of the New England Patriots, and rapper Meek Mill are participating in the 35th International March of the Living in Poland.
The march commemorates the 80th anniversary of the Warsaw Ghetto Uprising.
Kraft's Foundation to Combat Anti-Semitism has launched a $25 million "Stand Up to Jewish Hate" campaign.
Mike Tyson, Tom Brady, Jon Bon Jovi, and others are supporting the campaign.
Students, survivors, educators, and notable names like Ari Emanuel and Wolf Blitzer are also participating.
The march travels silently through Auschwitz-Birkenau, the largest Nazi concentration camp.
Kraft will light a torch to commemorate the six million who died during the Holocaust.
A ceremony for the Warsaw Ghetto Uprising took place earlier.
Meek Mill asked Kraft how he could do more to help others, and Kraft advised him to be a leader and build bridges.
Kraft started the foundation due to concerns about hatred and bigotry in the United States.