Why one physician took the risk of becoming an F.B.I. informant to expose alleged Medicare fraud.

How an activist investor does business (and ruins lives).

The dramatic imbalance in pay and power has created the conditions for abuse.

Bill Ackman’s hedge fund planned to make a fortune while doing good by exposing Herbalife as a scheme that preyed upon and lied to the poor. How one of the highest profile stock shorts in market history went awry.

On the adultery website AshleyMadison.com.

A profile of Anita Sarkeesian, who has recieved death threats as she exposes misogyny in the $25 billion video game industry.

A profile of Larry Garrison, the man who “gets paid to bring tabloid stories to TV news programs.”