The privileged information; inside story: want the inside dope on the apartment
So as Tom Snyder used to say: Sit back, relax, and watch the inside dope as it flies through the air.
Usually the source isn't close to the inside dope, so most of the columns are pretty inaccurate.
They bet their money because the 'inside dope' said that the big fix was in.
That is what I do, and I get mad when I read something that does not give me the inside dope on it.