The Weather Underground's ideology changed direction in the early 1970's.

A high-school friend of his had an older brother who knew somebody connected to the Weather Underground.

The group then changed its name to Weather Underground.

Then again, Weather Underground may be too radical a name for some people.

Time has not been kind to the reputation of the Weather Underground.

Now, of course, any given guy in a suit might be a former member of the Weather Underground.

Must have been in the Weather Underground or something.

She then went on to join the Weather Underground as a public member until its demise.

He is a former head of the Weather Underground.

She was also a member of the Weather Underground.