Matt DeBergalis pleaded the Fifth Amendment during his deposition before three House committees investigating ActBlue's fraud prevention standards.
https://www.foxnews.com/politics/actblue-co-founder-pleads-fifth-amendment-closed-door-house-gop-grilling
https://www.foxnews.com/politics/actblue-co-founder-pleads-fifth-amendment-closed-door-house-gop-grilling