Internal affairs files show that a white Massachusetts police sergeant whose arrest of a black Harvard professor ignited a national furor was twice before accused of racial bias, but cleared in both cases.

Sgt. James Crowley says all parties are looking forward.

A Massachusetts congressman is using President Barack Obama’s planned “beer summit” with a white police officer and a black scholar to make a pitch for local brews.

The president invites a Harvard scholar and the officer who arrested him to the White House for a beer.

A Cambridge police officer is heard calling a Harvard scholar uncooperative.

President Barack Obama calls the policeman who arrested a Harvard scholar.

A multiracial group of police officers stood with the white officer who arrested a black Harvard scholar and asked President Barack Obama and Massachusetts Gov. Deval Patrick to apologize for comments union leaders called insulting.

A police officer who arrested a Harvard scholar says he did nothing wrong.