(1) Political parties shall participate in the formation of the political will of the people. They may be freely established. Their internal organisation must conform to democratic principles. They must publicly account for their assets and for the sources and use of their funds.
(2) Parties that, by reason of their aims or the behaviour of their adherents, seek to undermine or abolish the free democratic basic order or to endanger the existence of the Federal Republic of Germany shall be unconstitutional.
(3) Parties that, by reason of their aims or the behaviour of their adherents, are oriented towards an undermining or abolition of the free democratic basic order or an endangerment of the existence of the Federal Republic of Germany shall be excluded from state financing. If such exclusion is determined, any favourable fiscal treatment of these parties and of payments made to those parties shall cease.
(4) The Federal Constitutional Court shall rule on the question of unconstitutionality within the meaning of paragraph (2) of this Article and on exclusion from state financing within the meaning of paragraph (3).
(5) Details shall be regulated by federal laws.