Here were some of the post-1890 criminal activities of Butch Cassidy and friends (from wikipedia):
On August 13, 1896, Cassidy, Lay, Harvey Logan and Bob Meeks[7] robbed the bank at Montpelier, Idaho, escaping with approximately $7,000. Shortly thereafter he recruited Harry Longabaugh, alias "The Sundance Kid", a native of Pennsylvania, into the Wild Bunch.
In early 1897, Cassidy was joined at Robbers Roost by his off and on girlfriend Ann Bassett, Elzy Lay, and Lay's girlfriend Maude Davis. The four hid out there until early April, when Lay and Cassidy sent the women home so that they could plan their next robbery. On April 21, 1897, in the mining town of Castle Gate, Utah, Cassidy and Lay ambushed a small group of men carrying the payroll of the Pleasant Valley Coal Company from the railroad station to their office, stealing a sack containing $7,000 in gold, with which they again fled to the Robbers Roost.
On June 2, 1899, the gang robbed a Union Pacific Overland Flyer near Wilcox, Wyoming, a robbery that became famous and which resulted in a massive man hunt.[8][9] Many notable lawmen of the day took part in the hunt for the robbers, but they were not found.
During one shootout with lawmen following that robbery, both Kid Curry and George Curry shot and killed Sheriff Joe Hazen. Noted killer for hire and contract employee of the Pinkerton Agency, Tom Horn, obtained information from explosives expert Bill Speck that revealed that they had shot Hazen, which Horn passed on to Pinkerton detective Charlie Siringo. The gang escaped into the Hole-In-The-Wall. Siringo was assigned the task of capturing the outlaw gang. He became friends with Elfie Landusky, who was by then going by the last name Curry alleging that Lonny Curry, Kid Curry's brother, had gotten her pregnant. Through her, Siringo intended to locate the gang.
On July 11, 1899, Lay and others were involved in a Colorado and Southern Railroad train robbery near Folsom, New Mexico, which Cassidy may have planned and may have been directly involved in, which led to a shootout with local law enforcers in which Lay, arguably Cassidy's best friend and closest confidante, killed Sheriff Edward Farr and posseman Henry Love, leading to his imprisonment for life in the New Mexico State Penitentiary.
Also, the Dalton Gang's Coffeyville KS bank-robbery/fiasco was in late 1892.