How come?
A well known quote of his :
"Jag tror efter de studier vi gjort är korrekt att säga att Arbetsgivareföreningens propagandister i mycket framstår som hatets och illviljans kolportörer mot svensk arbetarrörelse"
Basically, this in very sofisticated words describes the Employer organisation's "propagandists" as agents of hate and ill-will against the labour movement. Quite an insult against political opponents. Today, we are perhaps used / more exposed to similar language in social media etc. But during this time, there was nothing like it.
This should be understood against the backdrop of the politics of the time. Sweden was at the time significantly more socialist, very high income taxes, and the right probably felt that there were no limits how far social democratic politicians were prepared to go. Right or wrong, this was the sentiment among many.
His language was often arrogant and in ways derogatory, but not similar to Trump's bombastic tone. In contrast, using much more elegant and precise prose.
I am certain I will get replies that will defend his deeds and oppose how I describe him. Understand that just like society appeared during his reign - two sides who could not understand the other.