Del Bigtree, a leading voice in the anti-vaccine movement, brought in a record windfall last year for the nonprofit group he founded, according to the latest tax filings. 

The Informed Consent Action Network, known as ICAN, reported $23 million in revenue for 2023, a 74% increase from the previous year. The group spent nearly $17 million on efforts including legal battles and anti-vaccine advocacy, an increase of about 25% from the year before. 

The tax documents, obtained by NBC News from…