762 F.2d 243 (2d Cir. 1985) Cited 1,192 times
Holding Fed.R.Civ.P. 11 requires sanctions against "an attorney and/or his client when it appears that a pleading has been interposed for any improper purpose, or where, after reasonable inquiry, a competent attorney could not form a reasonable belief that the pleading is well grounded in fact and is warranted by existing law or a good faith argument for the extension, modification, or reversal of existing law."