During the 1930s and 1940s, he was an outspoken public critic of fascism and Nazism, which were growing in strength in Europe leading up to World War II. His activism included contributing over $250,000 to more than 850 organizations involved in war relief, along with cultural, educational and religious groups. During the 1950s, he was called to testify at the House Un-American Activities Committee during the Red Scare, but was cleared of any Communist involvement.
Robinson's roles included an insurance investigator in the film noir Double Indemnity, Dathan (adversary of Moses) in The Ten Commandments, and his final performance in the science-fiction story Soylent Green. Robinson received an Academy Honorary Award for his work in the film industry, which was awarded two months after he died in 1973. He is ranked number 24 in the American Film Institute's list of the 25 greatest male stars of Classic American cinema.