See this set of documents, which CREW describes as follows:

Ctizens for Responsibility and Ethics In Washington (CREW) has filed a Federal Election Commission (FEC) complaint against Leopoldo Fernandez Pujals, a foreign national, and Mauricio Claver-Carone, Gus Machado, Cuba Democracy Advocates, Inc. and the US-Cuba Democracy PAC for serious violations of federal campaign finance law. The complaint alleges that Leopoldo Fernandez Pujals, through Cuba Democracy Advocates, Inc., indirectly participated in the decision-making process of the US-Cuba Democracy PAC in violation of the strict prohibition on foreign national contributions to U.S. candidates.