Greece

1. Greek citizens possessing the right to vote may freely found and join political parties, the organization and activity of which must serve the free functioning of democratic government.
Citizens who have not yet acquired the right to vote may participate in youth sections of parties.
2. Political parties are entitled to receive financial support by the State for their electoral and operating expenses, as specified by law. A statute shall specify the guarantees of transparency concerning electoral expenses and, in general, the financial management of political parties, of Members of Parliament, parliamentary candidates and candidates for all degrees of local government. A statute shall impose the maximum limit of electoral expenses, may prohibit certain forms of pre-electoral promotion and shall specify the conditions under which violation of the relevant provisions constitutes a ground for the forfeiture of parliamentary office on the initiative of the special body of the following section. The audit of the electoral expenses of political parties and parliamentary candidates is carried out by a special body which is constituted also with the participation of senior magistrates, as specified by law. A law may also extend these regulations to candidates for other offices held through election.
... (Art. 29)