On Sep 10, 3:13 pm, "Scott H" wrote:

Collusion is an agreement, usually secretive, which occurs between two
or more persons to deceive, mislead, or defraud others of their legal
rights, or to obtain an objective forbidden by law typically involving
fraud or gaining an unfair advantage. It can involve "wage fixing,
kickbacks, or misrepresenting the independence of the relationship
between the colluding parties."

http://en.wikipedia.org/wiki/Collusion

Or something approximating a civil conspiracy without a violation of
rights I suppose.
http://en.wikipedia.org/wiki/Conspiracy_(civil)

Or in a love triangle one person sometimes uses a second person in the
relationship to influence a third person without the second person
knowing about it.
http://en.wikipedia.org/wiki/Love_triangle

http://www.youtube.com/watch?v=UWmcDLOjkjI