efendant's acts that cause injury to a plaintiff renews the cause of action for purposes of the statute of limitations. See Zenith Radio Corp. v. Hazeltine Research, Inc, 401 U.S. 321, 338, 91 S.Ct._ 795, 28 L.Ed.2d 77 (1971) (applying continuing violation doctrine to anti-trust cases); Nat'! Adler. Co. v. City (d