Other events associated with mass hysteria include lynching
McCarthyism
Communism
All of the above

McCarthyism

Explanation:

McCarthyism was a practice that led to mass hysteria in the United States as it augmented a period known as the Second Red Scare, a fear that Communism was taking root in the United States and spreading into all forms of American life.

U.S. senator Joseph McCarthy seized upon this fear and made wild accusations of treason and subversion in relation to communism and dragged many prominent Hollywood names and scientists to hearings that soiled their names.

This period came to an end when McCarthy overreached his influence and suggested that President Truman was a Communist. This as well as opposition from Chief Justice Earl Warren led to him losing support thereafter and the period fading out.

it u understand what he thought at the time and let u know more about him then what third person would of known probably. hope this : )