WASHINGTON  In the next several months, the Supreme Court will decide at least a half-dozen cases about the rights of people accused of crimes involving drugs, sex and corruption. Civil liberties groups and associations of defense lawyers have lined up on the side of the accused.

But so have conservative, libertarian and business groups. Their briefs and public statements are signs of an emerging consensus on the right that the criminal justice system is an aspect of big government that must be contained.

The development represents a sharp break with tough-on-crime policies associated with the Republican Party since the Nixon administration.

“It’s a remarkable phenomenon,” said Norman L. Reimer, executive director of the National Association of Criminal Defense Lawyers. “The left and the right have bent to the point where they are now in agreement on many issues. In the area of criminal justice, the whole idea of less government, less intrusion, less regulation has taken hold.”