Until 1989, the corporate tax was 52%. Yes there were various deductions, but still, 52%. Then a wealth tax of 2.5% on assets (all asset classes) over 1.6 million kronor - about $1.5 million in todays monetary value. This wealth tax could also be collected from a corporation when its liquid holdings exceeded double than that that of its debt.
Add to that, a intense political debate about introducing the so called Employee Funds - a mechanism in where a large part of the collected corporate tax would be dedicated to buying shares in the taxed corporation, shares that would then be distributed among the employees with a goal of collective ownership.
Perhaps indicative of the business climate in 1970s Sweden, Astrid Lindgren, the author of Pippi Longstocking, famously wrote a short satirical story about her over 100% margin tax rate. https://en.wikipedia.org/wiki/Pomperipossa_in_Monismania.