No-one knows if Adams was IRA?
He was part of an IRA delegation in secret talks with the government in the 70s.
Consider Guest LK867's reports, and the risk he runs making them.
The eldest McConville said "The dogs in the street know."

Abduction, interrogation under torture, execution, secret burial.
It is inconceivable that senior ranks of the Belfast Brigade were not aware of the operation.
They would have ordered it and been kept informed of the progress.

Sinn Fein state that it is right to continue to investigate the crime.
They support it, until it starts to get anywhere.