Trump Today in Ohio Adoration Rally:

ABC News: President Trump says Democrats not applauding at the State of the Union were "un-American...can we call that treason? Why not."

NYT:   Trump Accuses Democrats of ‘Treason’ Amid Market Rout

WASHINGTON — President Trump on Monday accused Democrats who did not clap during his State of the Union address of being un-American and even treasonous....

Applause and treason under Communism and Joseph Stalin, 1930's.

Joseph Stalin  was a Soviet revolutionary and political leader. Governing the Soviet Union as its dictator from the mid-1920s until his death in 1953, he served as General Secretary of the Central Committee of the Communist Party of the Soviet Union from 1922 to 1952...

Aleksandr Solzhenitsyn wrote a 3 volume work about the Soviet forced labor camp system. The book is a narrative relying on eyewitness testimony and primary research material, as well as the author's own experiences as a prisoner in a gulag labor camp. Written between 1958 and 1968, it was published in the West in 1973.

From the Gulag Archipelago, pp 69-70

The History of Our Sewage Disposal System
pg. 69

In the arrest of rank-and-file members of the Party there was
evidently a hidden theme not directly stated anywhere in the
indictments and verdicts: that arrests should be carried out
predominantly among Party members who had joined before
1924.

    Here is one vignette from those years as it actually occurred.
A district Party conference was under way in Moscow Province.
It was presided over by a new secretary of the District Party
Committee, replacing one recently arrested. At the conclusion
of the conference, a tribute to Comrade Stalin was called for.
Of course, everyone stood up (just as everyone had leaped to
their feet during the conference at every mention of his name).
The small hall echoed with "stormy applause, rising to an ovation."
For three minutes, four minutes, five minutes, the "stormy applause rising to
an ovation," continued.  But palms were getting
sore and raised arms were already aching. And the older people
were panting from exhaustion.  It was becoming insufferably silly
even to those who adored Stalin. However, who would
dare be the first to stop?  The secretary of the District Party
Committee could have done it.  He was standing on the platform,
and it was he who had just called for the ovation.  But he was a
newcomer.  He had taken the place of a man who'd been arrested.
He was afraid! After all, NKVD men were standing in the hall
applauding and watching to see who quit first!  And in that obscure,
small hall, unknown to the Leader, the applause went on
-- six, seven, eight minutes!  They were done for!  Their goose
was cooked!  They couldn't stop now till they collapsed with
heart attacks!  At the rear of the hall, which was crowded, they
could of course cheat a bit, clap less frequently, less vigorously,
not so eagerly --but up there with the presidium where everyone
could see them?  The director of the local paper factory, an

pg. 70

independent and strong-minded man, stood with the presidium.
Aware of all the falsity and all the impossibility of the situation,
he still kept on applauding! Nine minutes!  Ten!  In anguish he
watched the secretary of the District Party Committee, but the
latter dared not stop.  Insanity!  to the last man!  with make-
believe enthusiasm on their faces, looking at each other with
faint hope, the district leaders were just going to go on and on
applauding till they fell where they stood, till they were carried
out of the hall on stretchers!  And even those who were left
would not falter.....Then, after eleven minutes, the director of
the paper factory assumed a businesslike expression and sat
down in his seat.  and, oh, a miracle took place!  Where had the
universal, uninhibited, indescribable enthusiasm gone?  To a man
everyone else stopped dead and sat down.  They had been saved!
The squirrel had been smart enough to jump off his revolving
wheel.

    That, however, was how they discovered who the independent
people were.  And that was how they went about eliminating
them.  That same night the factory director was arrested.  They
easily pasted ten years on him on the pretext of something quite
different.....