Pressure to change the nominating system mounted in the turbulent political climate of the 1960s, due to the perception that the process was undemocratic. A transforming event occurred at the Democratic convention in 1968, where violent confrontations between war protesters and the Chicago police outside the convention hall, and bitter credentials disputes inside, spurred Democrats to completely change the party's nominating rules. The new rules transferred the power of choosing delegates from party leaders to rank-and-file voters, opening the process to widespread popular participation for the first time. Many state parties switched to primaries to comply with the newly adopted national party rules. The Republican Party also modified its rules in the early 1970s.