Final answer:
Fannie Lou Hamer helped start the Mississippi Freedom Democratic Party, making considerable contributions to the civil rights movement by opposing racial injustice and advocating for equal rights.
Step-by-step explanation:
One of the organizations that Fannie Lou Hamer helped start was the Mississippi Freedom Democratic Party (MFDP). Hamer's role in the civil rights movement was significant, as she encountered harsh treatment for her efforts, including being fired, evicted, arrested, and beaten while trying to register black voters during the Freedom Summer of 1964.
As a delegate of the MFDP, she delivered a powerful and memorable speech at the Democratic National Convention in Atlantic City, posing the compelling question, "Is this America?" which challenged the nation to face its history of racism and violence. Through her work with the MFDP, Hamer made substantial contributions to the civil rights movement, highlighting her commitment to achieving justice and equality.