That seems to be a typical response. "Oh, it wasn't real communism/socialism". Yet, we see the same thing in China, N. Korea, Cuba, Venezuela, and every place communism or socialism has been tried. Every time the answer is the same, it wasn't the real one."
The US isn't real Socialist either, but despite the ever expanding costs of supporting parasitic States with moribund economies, not many complaints so far, other than finger pointing at the big bad bogeyman Chicago.
"Every time socialism is tried, the state had to kill, censor, and use violence to control people and maintain power."
Every time any ism is tried, the state has to kill, censor, and use violence to control people and maintain power.
Or are you not vaguely aware of American history and domestic and foreign policy to date?
"Just like the leftist now, they cannot have decent or freedom of thought."
Since the very mission of leftists is about liberizing beliefs, expression and lifestyles, your statement is patently false.
"Anyone who disagrees with their narrative must be silenced."
Trump, his Alt Right Republican base, and every single oppressive thing they stand for are hardly leftists. Threatening to jail dissidents, discredit and unlicense media, dismantle the Constitution and Goverment are their expressed intentions on how to silence any and all opposition.
"Nazi's are bad, but they are a VERY small fringe group in the U.S. The number of people claiming to be Socialist is growing, and I propose they are just as evil."
There are no Nazi's in the US.
Neo Nazism and other nicknames for xenophobia are what got Trump into the White House.
Don't like Socialism? Unplug, get off the grid, build it yourself, pay for goods and services out of pockets and at actually unsubsidized value. Done.