New York

There's a song about this place.

Single transferable vote
To weaken the party machine that was controlling New York City, progressive forces pushed for the adoption of STV there, and STV was adopted by voters of the city in 1936. Before this change, Democrats would win above 90% of the seats on the Board of Aldermen; in the first election after proportional representation, in 1941, the Democrats won 65.5% of the seats with 64% of the vote, with four other parties also being represented.

The Democratic party machine fought back and managed to repeal the method in 1947, using red-baiting tactics. In the New York Post in 1947, Tammany Hall leader Frank J. Sampson called STV "This Stalin Frankenstein system" and "a foreign political theory that has created confusion with the blessing of  the Kremlin".

After the repeal, the old arrangement quickly restored itself: in 1949, the Democratic party won 24 of the 25 seats.