[1] Later that year, he moved north into the Wisconsin Territory, arriving first at New Diggings—then part of Iowa County—and, in December, settling in Mineral Point.

He established a law practice there, in partnership with Francis J. Dunn and David W. Jones, and became involved with local affairs.

Booth had assisted Joshua Glover in his escape from slavery to freedom in Canada and was being prosecuted under the federal Fugitive Slave Act of 1850.

The Wisconsin Supreme Court ruled, in 1854, that the Fugitive Slave Act was unconstitutional and freed Booth on a defective warrant.

[1] Judge Crawford was defeated seeking re-election in 1855 and resumed his law practice in Mineral Point.