“Under the guise of having every voice heard, you create mob rule, a filterless society where secrets are crimes.”

Narrator
The Great Dictator (1940)

“Though Control in the USA: The Case of the Middle East,” Index on Censorship, July/August 1986, quoted in John H. George, Be Reasonable: Selected Quotations for Inquiring Minds, Prometheus Books, 1994 p. 64
Quotes 1960s-1980s, 1980s
Context: From a comparative perspective, the United States is unusual if not unique in the lack of restraints on freedom of expression. It is also unusual in the range and effectiveness of methods employed to restrain freedom of thought... Where the voice of the people is heard, elite groups must insure their voice says the right things… The less the state is able to employ violence in the defense of the interest of the elite groups that effectively dominate it, the more it becomes necessary to devise techniques of ‘manufacture of consent’… Where obedience is guaranteed by violence, rulers may tend towards a ‘behaviourist’ conception; it is enough that people obey; what they think does not matter too much. Where the state lacks means of coercion, it is important to control what people think.

Comedic response to CW network questioning about Italian heritage at festival booth.
Source: https://www.imdb.com/name/nm9556267/bio?item=nq0320448#quotes

Remarks http://www.margaretthatcher.org/document/105691 on Orgreave picketing (30 May 1984)
Second term as Prime Minister
Context: You saw the scenes that went on in television last night. I must tell you that what we have got is an attempt to substitute the rule of the mob for the rule of law, and it must not succeed. It must not succeed. There are those who are using violence and intimidation to impose their will on others who do not want it... Ladies and Gentlemen we need the support of everyone in this battle which goes to the very heart of our society. The rule of law must prevail over the rule of the mob.

Source: Green Mars (1993), Chapter 9, “The Spur of the Moment” (p. 480)

There are no indications that Jefferson ever stated anything like this; slight variants of this statement seem to have become widely attributed to Jefferson only since its appearance in three books of 2004: The Adventures of Jonathan Gullible: A Free Market Odyssey (2004) by Ken Schoolland, p. 235; Damn-ocracy — Government From Hell!: The Political, Economic And Money System (2004) by Wendall Dennis and Reason And Reality : A Novel (2004) by Mishrilal Jain, p. 232; see also info at Thomas Jefferson Encyclopedia http://wiki.monticello.org/mediawiki/index.php/Democracy_is_nothing_more_than_mob_rule.
Misattributed

"The Party of Man-Haters," https://townhall.com/columnists/ilanamercer/2018/10/19/the-party-of-manhaters-n2530054 Townhall.com, October 19, 2018
2010s, 2018