A state ban on political contributions to candidates by businesses was upheld by a Suffolk Superior Court judge last week. Massachusetts campaign finance law prohibits contributions from businesses but allows contributions from labor unions.

Two businesses active in a fiscally conservative advocacy group challenged the law hoping for a change in favor of businesses wishing to contribute, asserting the same political contribution rules should apply to businesses and unions.

The Office of Campaign and Political Finance argued businesses are different from unions and the state is within its rights to regulate each entity differently, maintaining the state’s interest in preventing corruption or the appearance of corruption.

Under the upheld law, individuals can contribute $1,000 per year to candidates and labor unions can contribute up to $15,000.