Communism as defined by Marx and as practiced by the Soviet Union, China, and the DDR. But you can expand to socialism in the widest sense if you like. Still a bad idea that attracts some very smart people.
I said your own words, not "as defined by" others.
I've yet to meet anyone who throws around "communism" like that who uses it as anything but a vacuous memetic catchphrase, detached from any real understanding.