What two spy cases increased fear of communism in the united states?

The two spy cases that increased fear of communism in the United States were the Rosenbergs and Alger Hiss.

Explanation:

-Julius Rosenberg and Ethel Greenglass Rosenberg were a couple of Jewish Americans who were executed in 1953 after being denounced and convicted of espionage. The allegations were in connection with the transmission of information about the atomic bomb to the Soviet Union. Their execution was the first of civilians by espionage in the history of the United States.

-Alger Hiss was an official of the Department of State. He was accused in 1948 of having been a Soviet spy. The facts being then prescribed, so he could no longer be sentenced for espionage. However, having denied at a hearing where he had sworn the reality of his espionage activities, he was guilty of perjury and was sentenced for that in 1950.

four sitting presidents have been assassinated while in office but the first was abraham lincoln,

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.