It is interesting to note that the name adopted by the left in the USA during the 1920's was Progressive. They had a political party called the "Progressive" party whose candidate for President Robert LaFollette got about 17 percent of the vote in 1924.
By 1932 members of the Progressive party had been absorbed into the Democratic party. By the late 20's the Progressive name had become a liability so they changed the name to Liberal.
Now that the voters have rejected the Liberal connotation they have returned to their former name of progressives.
No doubt once the term progressive takes on the same negative connotation it once had they will resume using the name liberal.