Who invalidated or limited the effectiveness of laws passed to support the Populists?

AThe U.S. Supreme Court
BPresident Howard Taft
CThe U.S. Senate
DBig Business

Verified Answer :

It would be primarily "A) The U.S. Supreme Court" that invalidated or limited the effectiveness of laws passed to support the Populists, since during this time the court tended to side with "big business".