Digging on Bill and Earl Browder…
Came across this in the C_A archives…States with highest number of Communist Party members in 1951 coincide with typically "Blue" Dem states today.
https://www.cia.gov/library/readingroom/docs/CIA-RDP78-00915R000400390002-3.pdf
https://en.wikipedia.org/wiki/Red_states_and_blue_states