About Tony Cliff
Tony Cliff was a Trotskyist activist. Born to a Jewish family in Ottoman Palestine, he moved to Britain in 1947 and by the end of the 1950s had assumed the pen name of Tony Cliff. A founding member of the Socialist Review Group, which became the International Socialists and then the Socialist Workers Party, in 1977. Cliff was effectively the leader of all three. The first edition of his short book on Rosa Luxemburg in 1959 was possibly the first use of the pen name 'Tony Cliff'.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.