Why did many american fear communist

i think the answer is simple, the definition of communism is, a political theory derived from Karl Marx, advocating class war and leading to a society in which all property is publicly owned and each person works and is paid according to their abilities and needs.  If it were me i would not want my belongings to just be taken away, because everything is publicly owned

this is the link to the communism definition:

https://www.google.com/search?q=communism&rlz=1CAMKOE_enUS839&oq=commun&aqs=chrome.3.69i57j69i61j0l4.5646j0j4&sourceid=chrome&ie=UTF-8

Explanation:

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.