Quotes by famous people advocating for socialism

Albert Einstein:
"I am convinced there is only one way to eliminate these grave evils, namely through the establishment of a socialist economy, accompanied by an educational system which would be oriented toward social goals. In such an economy, the means of production are owned by society itself and are utilized in a planned fashion. A planned economy, which adjusts production to the needs of the community, would distribute the work to be done among all those able to work and would guarantee a livelihood to every man, woman, and child."
Source: "Why Socialism?", published in the first issue of the Monthly Review, May 1949.

Martin Luther King, Jr:
"I am much more socialistic in my economic theory than capitalistic. Today capitalism has outlived its usefulness. It has brought about a system that takes necessities from the masses to give luxuries to the classes."
Source: A letter to Coretta Scott in 1952.

Pablo Picasso:
"I am a communist, and my painting is a communist painting."
Source: "Pablo Picasso: The Communist Years." This quote is from an interview Picasso did with Jerome Seckler in 1945. In addition to giving this quote, Picasso also received the Stalin Peace Price from the Soviet government in 1950.

Helen Keller:
"I am no worshiper of cloth of any color, but I love the red flag and what it symbolizes to me and other Socialists. I have a red flag hanging in my study, and if I could I should gladly march with it past the office of the Times and let all the reporters and photographers make the most of the spectacle."
Source: "Helen Keller: How I Became a Socialist".

Frida Kahlo:
"I’ve learnt so much here and I'm more and more convinced it's only through communism that we can become human."
Source: A letter to the Communist League of America.