An economic and
political system in which the
economy is designed to meet
the needs of the people, but the
political power is held by a certain group and/or individual. Any
society which is
socialist, but non-democratic. Many would claim that true
socialism requires
democracy by definition.
Communism, as envisioned by Marx and described as a "dictatorship of the proletariat" is authoritarian socialism, although not a true dictatorship. Not all communism is authoritarian, as the anarcho-communists will tell you.
Cuba is an example of an authoritarian socialist state.