Check out our Diddy/Dirty Money section for more posts about Diddy/Dirty Money.
From AllHipHop.com:

The New York Police Department monitored and spied on various rappers months before the 2004 Republican National Convention, which was held in New York. ...

According to the documents, Sean "Diddy" Combs, Jay-Z, LL Cool and Alicia Keys were all put under surveillance in the months before the 2004 Republican National Convention arrived in New York.