Still, all five commissioners agreed at the November Senate hearing that the agency needed more money and greater regulatory authority to keep up with big tech. Critics said a greater problem was cultural. The F.T.C. is haunted, for example, by a clash with Congress in the 1980s over an attempt by the agency to ban television ads for junk food directed at children, known as “KidVid.” Lawmakers pulled funding and severely weakened the F.T.C.’s power to issue new regulations. Even today, “in just about every meeting I have at the F.T.C., staff mention KidVid,” said Josh Golin, the executive director of Campaign for a Commercial Free Childhood, which has filed complaints against YouTube and Facebook.