Dear Mr. Mcclntic,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Subject and Policy Files, 1906- 1957 in the Records of the Immigration and Naturalization Services, 1787- 2004 (Record Group 85) that includes the Cowen Report- European Investigation Entry No. 9; File No. 51411/056. It was an investigation conducted on the immigration of Jews from Russia to America and may include information about smuggling. The report has been digitized and is available using the Catalog.
We also suggest contacting the Center for Jewish History at 15 West 16th Street, New York, NY 10011. The center has a partnership between five institutions that have collections documenting Jewish history throughout the world and they may be able to guide your search.
We also suggest that you contact the Federal'naia arkhivnaia sluzhba Rossii (Rosarkhiv) [Federal Archival Service of Russia], ul. Il'inka 12, 103132 Moscow, Russia.
We hope this is helpful. Best of luck with your research!