Congressman Jim McGovern, co-author of the United States' Magnitsky Act, has predicted there will be additions to the U.S. black list of Russian officials blamed for the allegedly illegitimate prosecution and death in custody of Sergei Magnitsky, a Russian auditor for British investment fund Hermitage Capital, the fund said.

The 18-name list of officials, chiefly law enforcement officers, who are subject to U.S. visa and financial sanctions, was published by the U.S. administration on April 12.

A Hermitage statement cited McGovern as saying the list was the first step in enforcing the Magnitsky Act. The congressman said he expected new names to be added to the list soon.

In a letter to U.S. Secretary of State John Kerry, McGovern urged the State Department to lobby for similar sanctions to be used worldwide.

The Magnitsky Act prescribes that the U.S. administration make annual reports on measures based on the act.

What is officially entitled Russia and Moldova Jackson-Vanik Repeal and Sergei Magnitsky Rule of Law Accountability Act was signed into law by President Barack Obama in December last year. The United States believes Magnitsky's death had not been properly investigated.

In July 2013, Moscow's Tverskoi Court posthumously declared Magnitsky guilty of complicity in tax evasion. Magnitsky and others were accused of running a scheme where more than 500 million rubles allegedly failed to reach the Russian state treasury.

The court quashed proceedings against Magnitsky due to his death, but refused to exonerate him.

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