Final answer:
The First Red Scare and the Red Summer are linked by the widespread fear of communist infiltration, leading to discrimination and government actions such as the Palmer Raids targeting various groups in American society.
Step-by-step explanation:
The First Red Scare and the Red Summer are interconnected through the atmosphere of fear and suspicion that pervaded the United States in the wake of the Bolshevik Revolution. One way they are connected is through the fear of communist infiltration which led to widespread paranoia and discrimination against not only known radicals but also any form of dissent or radical thought.
This fear was intensified by events such as the Red Summer of 1919, when race riots further polarized American society. Another connection is the government's response to these fears which included the Palmer Raids, targeting immigrant groups, labor unions, and others accused of radical activities, leading to arrests, deportations, and the violation of individual rights.