Because of their large size and scope, omnibus bills limit opportunities for debate and scrutiny. Historically, omnibus bills have sometimes been used to pass controversial amendments. For this reason, some consider omnibus bills to be anti-democratic.
In the United States, examples include reconciliation bills, combined appropriations bills, and private relief and claims bills.
Omnibus legislation is routinely used by the United States Congress to group together the budgets of all departments in one year in an omnibus spending bill. For example, the Omnibus Budget Reconciliation Act of 1993 was designed to help reduce the federal deficit by approximately $496 billion over five years through restructuring of the tax code.
During the 19th century, there were three notable omnibus bills.
The Compromise of 1850 had five disparate provisions designed by Sen. Henry Clay of Kentucky. His purpose was to pacify sectional differences that threatened to provoke the secession of the slave states. The Fugitive Slave Act was the most infamous of the five compromise components, and was almost universally excoriated by abolitionists, the chief exception being Sen. Daniel Webster of Massachusetts who prioritized preservation of the Union. Sen. Thomas Hart Benton, a Missouri slaveholder, opposed the omnibus compromise as an "unmanageable mass of incongruous bills, each an impediment to the other...." Nonetheless, the bill passed Congress and accomplished its purpose. Disunion and civil war were delayed for a decade.