Some of them, like M5, were open secrets that everyone knew about.

But here's the season's little open secret: A lot of them don't think so.

It is an open secret that the two organizations are the same.

Those names have been an open secret for 18 years.

It is an open secret that he has taken contributions from them.

At its peak in the late 1940's, the relationship was an open secret among friends and family.

But that they do so is the open secret of perhaps a million persons.

To walk among people with the open secret of being alive.

And of course, my own family name is an open secret.

It is an open secret as to which of the state and military forces were behind this murder.