The groups in the network spent nearly $504 million on policy and political fights, including grants to about 150 allied groups, between mid-2015 and last year.
After leading efforts to put conservatives on the bench, the activist has quietly built a sprawling network and raised huge sums of money to challenge liberal values.
A Supreme Court environmental case being decided this month is the product of a coordinated, multiyear strategy by Republican attorneys general and conservative allies.