Most famous celebrity activists

[thebeloitmoderate]

Marlon Brando and Gregory Peck have been both supportive of civil rights during the 1960s at the time in which Hollywood as about to diversify and racial integration was rapidly happening across America.
The most famous (classic) actor might have to be Charlton Heston from being a Democrat into a gun rights activist

[Ferguson97]

Leonardo DiCaprio and Jane Fonda are obvious answers.

[dead0man]

Jim Brown

[T'Chenka]

Elliot Page is probably the most famous environmental racism activist.

[Amenhotep Bakari-Sellers]

George Clooney, Alyssa Milano  Lisa Bonet, Phylisha Rashad, Kim Fields D,  Scott Baio,  Rose McGowan, Ricky Schroeder , Bill Cosby and Adam Sandler R Sandler belong to country club R Golf club like Alex Ovechkin, Sander played in real life with Bob Barker Golf

So alot of these Rs, Arnie Schwarzenegger and Sylvester Stallone belong to R Golf clubs as well as NRA.

Everyone knows that the Blk celebrities like Tempest Bledsoe, Dawn Lawn and Queen Latifa during Fresh Prince era,were all Ds and Bill Cosby was the only Blk Republican men

[thebeloitmoderate]

Meek Mill himself is a criminal justice reform activist besides rapping.
Snoop Dogg while he is not as a big on social issues he is pro marijuana legalization.

[Klobmentum Mutilated Herself]

Jane Fonda, Warren Beatty, Paul Newman, Roger Waters, Carole King, Elizabeth Taylor, Neil Young, John Lennon & Yoko Ono, Yusuf Islam, Susan Sarandon, Danny Glover, Lady Gaga, Peter Gabriel, Bono, etc.

Many of the great black athletes from the 50s and 60s had no choice but to also be activists. Jackie Robinson, Bill Russell, Muhammad Ali, Jim Brown, and Hank Aaron come to mind. Kareem Abdul-Jabaar comes in a little later, but he's still active to this day.

[Never Made it to Graceland]

For modern day, Mark Ruffalo has to be one of the more famous/vocal consistent leftists out there.

[vitoNova]

Streisand.

For her role in The Way We Were alone.

[Badger]

Should Ted Nugent be listed?

[Torrain]

Define activist.

If we're talking about celebrities who decided to use their influence to exert political change, after growing tired with the existing consensus, I'd like to nominate a certain former comedian from Kryvyi Rih in Ukraine.

[kcguy]

I guess I'm the only one whose first thought was Michael J. Fox.

[Samof94]

Emma Watson