Flag of the Paneuropa Union
The Paneuropa, currently headed by Otto Habsburg, was founded in 1923 by Richard Nikolaus Count Coudenhove-Kalergi. It is credited with some influence over the creation of what is now the European Union. Paneuropa is, unsurprisingly, more active in Austria and the former Austro-Hungarian states. It is very anti-Communist and Christian Democratic in political orientation, with a strong Catholic influence. The famous 1989 "picnic" on the Austrian/Hungarian border was organized by Paneuropa.
The flag of the Paneuropa Movement, as seen on the main square in Zagreb, in the house of Croatian Council of European Movement, an organization that is promoting the European idea, is similar to the flag of the European Union with a yellow disc with a red cross on it placed inside the ring of stars.
The cross is the symbol of Christendom and the sun symbolizes the European civilization enlightening the world. After the Second World War, the flag was used by the European Parliamentary Union.