How was the Red Scare an example of conservatism?

The red scare after WWI was an example of conservatism
because one of the major tenets of conservatism in the 20th century was anti-communism. 
Conservatives are strongly opposed to communism on a number of
grounds.

Mos importantly, conservatives believe that the
way things have been is generally good.  They believe that the experience that societies
gain over the years is going to be superior to any theory that someone thinks up in
their own mind.  Therefore, they would say, a capitalist and democratic system that has
evoloved over centuries is better than a communist system that has never existed other
than in the mind of political theorists.

Conservatives
after WWI, then, did not want their society to be changed in radical ways.  Therefore,
they were worried about the possibility of radicals changing the system through
violence.  This is what led to the red scare and that is why the red scare was an
example of conservatism.