In the 1950's Russia was busy promoting its "left-wing" advocates in all Western countries, including spying that was frequently uncovered - because it was very suspicious to see left-wingers promoting left-wing ideas.. After 30 years of these efforts failing all the time Russia decided to stop the political influencing because it was clearly failing, so their efforts were changed to attack the Western cultures by promoting "right-wingers" - it's worked because the western governments still see Russia as communistic and don't believe that left-wingers would ever promote their "right-wing 'enemies'" - we haven't noticed that the right-wing views are pushing our economies off the cliff.
Sure, Conservative and Republican attitudes back in the 60's and earlier were "right-wing" but they were busy supporting their inhabitants of each country, not just the politicians - they were generally just good people describing their views back then. Russian political financing under the table has changed that.