Answer by taking a quote from the following article:

Louis Leo Holtz (born January 6, 1937) is a former American football player, coach, and analyst. He served as the head football coach at The College of William & Mary (1969-1971), North Carolina State University (1972-1975), the New York Jets (1976), the University of Arkansas (1977-1983), the University of Minnesota (1984-1985), the University of Notre Dame (1986-1996), and the University of South Carolina (1999-2004), compiling a career record of 249-132-7. Holtz's 1988 Notre Dame team went 12-0 with a victory in the Fiesta Bowl and was the consensus national champion. Holtz is the only college football coach to lead six different programs to bowl games and the only coach to guide four different programs to the final top 20 rankings.

After two seasons as a commentator for CBS Sports, Holtz came out of retirement in 1999 and returned to the University of South Carolina, where he had been an assistant in the 1960s. The year before Holtz arrived, the Gamecocks went 1-10, and the team subsequently went 0-11 during Holtz's first season. In his second season, South Carolina went 8-4, winning the Outback Bowl over the heavily favored Ohio State Buckeyes. The eight-game improvement from the previous year was the best in the nation in 2000 and the third best single-season turnaround in NCAA history. It also earned National Coach of the Year honors for Holtz from Football News and American Football Coaches Quarterly. In his third season, Holtz's success continued, leading the Gamecocks to a 9-3 record and another Outback Bowl victory over Ohio State. The nine wins for the season were the second highest total in the history of the program. Under Holtz's leadership, the Gamecocks posted their best two-year mark in school history from 2000 to 2001, going 17-7 overall and 10-6 in SEC play.  After consecutive 5-7 campaigns in 2002 and 2003, Holtz finished his South Carolina tenure on a winning note with a 6-5 record in 2004. Holtz's time in Columbia saw the resurrection of Gamecock Football, as the program had only one bowl win and no Top 25 finishes in the ten years before his hire. Upon his exit, USC had posted AP Top 25 finishes in 2000 and 2001 (#19 and No. 13 respectively) and had made consecutive New Year's Day bowls for the first time in its history. Holtz finished his six-year tenure at South Carolina with a 2-4 record versus his former team, Arkansas, beating the Razorbacks in Columbia, SC in 2000 and 2004.  In 2005, the NCAA imposed three years probation and reductions in two scholarships on the program for ten admitted violations under Holtz, five of which were found to be major. The violations involved improper tutoring and off-season workouts, as well as a lack of institutional control. No games were forfeited, and no television or postseason ban was imposed. Holtz issued a statement after the sanctions were announced stating, "There was no money involved. No athletes were paid. There were no recruiting inducements. No cars. No jobs offered. No ticket scandal."

What were the violations for?
The violations involved improper tutoring and off-season workouts, as well as a lack of institutional control.