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| style="background: #ccf; text-align: center;" | '''This article is part of the'''<br>'''[[Venona project|Venona]]'''<br>'''series.'''

! style="background: #ccf;" | This article is part of the<br/>[[Venona project|Venona]]<br/>series.

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| style="text-align: center;"|[[CPUSA]]

| [[CPUSA]]

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| style="text-align: center;"|[[Perlo group]]

| [[Perlo group]]

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| style="text-align: center;"|[[Coordinator of Inter-American Affairs]]

| [[Coordinator of Inter-American Affairs]]

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'''Joseph Gregg''' attended City College of New York and at the outbreak of war in Spain he travelled to that country and drove a truck for the [[Comintern]] affiliated Loyalists of the [[International Brigades]] for the duration of the war.  Upon return to the United States Gregg found employment with [[Robert Miller]] who was operating the ''Hemisphere'', a weekly newsservice on Latin American affairs.  

'''Joseph Gregg''' attended City College of New York and at the outbreak of war in Spain he travelled to that country and drove a truck for the [[Comintern]] affiliated Loyalists of the [[International Brigades]] for the duration of the war.  Upon return to the United States Gregg found employment with [[Robert Miller]] who was operating the ''Hemisphere'', a weekly newsservice on Latin American affairs.