"The entire last part of the 20th century was marked with right winged people assasinating progressives..."

Er,

Lee Harvey Oswald was an avowed communist
Sirhan Bishara Sirhan a Palestinian

Hardly right wing.

This fellow in Washington is an avowed socialist who wrote the christianity was a jewish plot promulgated by Paul of Tausus (aka Saint Paul) to overthrow Rome!

This is real hard to put into the American context of Right/Left identification.
Mark