Federal Multi-candidate PACs are limited in the amount of money they can contribute to other organizations:
at most $5,000 per candidate per election. Elections such as primaries, general elections and special elections are counted separately.
at most $15,000 per political party per year.
at most $5,000 per PAC per year.
Under federal law, PACs are not limited in their ability to spend money independently of a candidate campaign. [emphasis added]
In the 2004 elections, the top 10 PACs by money spent by themselves, their affiliates and subsidiaries were as follows:
EMILY's List $22,767,521
Service Employees International Union $12,899,352
American Federation of Teachers $12,789,296
American Medical Association $11,901,542
National Rifle Association $11,173,358
Teamsters Union $11,128,729
International Brotherhood of Electrical Workers $10,819,724
National Education Association $10,521,538
American Federation of State, County and Municipal Employees $9,882,022
Laborers' International Union of North America $9,523,837