Which team won three straight World Series from 1972 to 1974?

Which team won the 1981 World Series? Which team won the 1980 World Series, its first title? Which team won the 1979 World Series, with the theme song "We Are Family"? Which team won the 1976 World Series with a sweep of the Yankees? Which team won the 1970 World Series behind third baseman Brooks Robinson? Which team won the 1968 World Series behind Mickey Lolich's three wins? Which team won the 1965 World Series behind Sandy Koufax? Which team won five straight World Series from 1949 to 1953?