▁research ▁ ▁E ys en ck ' s ▁political ▁views ▁related ▁to ▁his ▁research : ▁E ys en ck ▁was ▁an ▁out sp oken ▁oppon ent ▁of ▁what ▁he ▁perce ived ▁as ▁the ▁author itar ian ▁ab uses ▁of ▁the ▁left ▁and ▁right ▁and ▁accordingly ▁he ▁believed ▁that ▁with ▁this ▁T ▁axis ▁he ▁had ▁found ▁the ▁link ▁between ▁naz ism ▁and ▁commun ism . ▁According ▁to ▁E ys en ck , ▁members ▁of ▁both ▁ide ologies ▁were ▁t ough - mind ed . ▁Central ▁to ▁E ys en ck ' s ▁th esis ▁was ▁the ▁claim ▁that ▁tender - mind ed ▁ide ologies ▁were ▁dem ocr atic ▁and ▁friendly ▁to ▁human ▁fre ed oms , ▁while ▁t ough - mind ed ▁ide ologies ▁were ▁ag gress ive ▁and ▁author itar ian , ▁a ▁claim ▁that ▁is ▁open ▁to ▁political ▁criticism . ▁In ▁this ▁context , ▁E ys en ck ▁carried ▁out ▁studies ▁on ▁naz ism ▁and ▁commun ist ▁groups , ▁claim ing ▁to ▁find ▁members ▁of ▁both ▁groups ▁to ▁be ▁more ▁" domin ant " ▁and ▁more ▁" ag gress ive " ▁than ▁control ▁groups . ▁ ▁E ys en ck ▁left ▁Naz i ▁Germany ▁to ▁live ▁in ▁Britain ▁and ▁was ▁not ▁sh y ▁in ▁attack ing ▁St alin ism , ▁not ing ▁the ▁anti - S emit ic ▁pre jud ices ▁of ▁the ▁Russian ▁government , ▁the ▁lux ur ious ▁l ifest yles ▁of ▁the ▁Soviet ▁Union ▁leadership ▁and ▁the ▁Or w elli an ▁" double th ink " ▁of ▁East ▁Germany