There’s a surprisingly long (to me) analysis of Marx in Karl Popper’s The Open Society and its Enemies though much of the book might be dated by the conditions

There’s a surprisingly long (to me) analysis of Marx in Karl Popper’s The Open Society and its Enemies though much of the book might be dated by the conditions of 1950-1960. He writes that Marx correctly saw problems with England’s capitalism in 19th century but never adjusted his views as conditions in England changed during his lifetime(labor reform).