"Third parties should be free to fundraise and express views on political issues as a means of free expression, and their activity should not be unconditionally prohibited. However, it is important that some forms of regulation, with comparable obligations and restrictions as apply to parties and party candidates, be extended to third parties that are involved in the campaign, to ensure transparency and accountability. Third parties should be subjected to similar rules on donations and spending as political parties to avoid situations where third parties can be used to circumvent campaign finance regulations."
OSCE (ODIHR), CoE (Venice Commission): Guidelines on Political Party Regulation, Second Edition, para. 256

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Guidelines on Political Party Regulation, Second Edition