Key legal question
Whether the appellant was liable under Art. 52 AHVG for unpaid social security contributions of X.________ AG.
Extracted holding
The appellant was liable because, despite knowledge of growing arrears, he failed to ensure payment or reduction of wages so that contributions could be paid.
Extracted reasoning
His conduct amounted to a serious breach of supervisory and payment duties; the damage was causally linked to that omission and no exculpation applied.