Celebrities have an immense platform and influence, and many American and international celebrities have used their fame to support nonprofits and organizations dedicated to racial justice. Their contributions range from financial donations to raising awareness and actively participating in protests and advocacy campaigns. Here are some examples:

1. Financial Donations:
- Oprah Winfrey: The media mogul has donated millions of dollars to various racial justice organizations, including the National Museum of African American History and Culture.
- Beyoncé: The renowned singer has financially supported organizations such as the Black Lives Matter movement and the NAACP Legal Defense Fund.
- Jay-Z: The rapper and entrepreneur has donated substantial amounts to organizations like the Trayvon Martin Foundation and the REFORM Alliance, which aims to reform the criminal justice system.
- Rihanna: The singer has contributed funds to organizations like the Bail Project and the Clara Lionel Foundation, which supports education and emergency response programs worldwide.

2. Public Advocacy and Awareness:
- Colin Kaepernick: The former NFL player took a knee during the national anthem to protest racial injustice, sparking a nationwide conversation. He also established the Know Your Rights Camp, which empowers black and brown communities.
- John Legend: The singer has been actively involved in criminal justice reform and has used his platform to advocate for racial equality.
- Emma Watson: The actress has been a vocal supporter of intersectional feminism and has spoken out against racial discrimination.
- Lupita Nyong'o: The Academy Award-winning actress has been an advocate for diversity and representation in the entertainment industry, raising awareness about racial injustices.

3. Participation in Protests:
- Kendrick Lamar: The rapper has not only used his music to address racial issues but has also participated in protests against police brutality.
- Janelle Monáe: The singer and actress has actively taken part in protests and been vocal about racial justice issues, both in her music and public statements.
- Michael B. Jordan: The actor has participated in protests and has used his platform to bring attention to racial disparities in the film industry and beyond.
- George Clooney: The actor has joined protests and has spoken out against systemic racism, using his influence to amplify the voices of marginalized communities.

These are just a few examples of how American and international celebrities have contributed to nonprofits and organizations dedicated to racial justice. Their efforts have helped raise awareness, provide financial support, and push for systemic change in the fight against racial inequality.