Both Ida B Wells and Marcus Garvey supported the position that

African Americans had to leave the South to avoid injustice.

Explanation:

Marcus Garvey, originally from Jamaica, established himself in New York City in 1916. Here, he opened a restaurant, started a newspaper and formed the Black Star Line, the first black-owned shipping company in the United States. Garvey believed that the only way for African Americans to achieve equality and full rights was for them to go back to Africa. Ida B. Wells shared this idea of relocation as a way to achieve equality. She believed that African Americans had to leave the South if they wanted to avoid injustice.

African Americans had to leave the South to avoid injustice