Bentley testified in the trials of four accused spies: The perjury trial of William Remington, a case against Abe Brothman for obstruction of justice, and Julius and Ethel Rosenberg trials on charges of conspiracy to commit espionage. Bentley was peripherally involved in the Rosenberg case. She was used by the prosecution to develop two points: first, the actions of American Communists in becoming spies for the Soviet Union; and second, to establish, if only vaguely in the jury's mind, a connection between Julius Rosenberg and Golos. She testified that she would receive calls from a man who identified himself as Julius, after which Golos would go out to meet him.