RTFA: http://federaltimes.com/index.php?S=3453925

IBM and several of its employees have been subpoenaed to testify before a grand jury on interactions between Environmental Protection Agency and IBM employees, a company spokesman said today.
The subpoenas, which were issued March 28 by the U.S. Attorney’s Office for the Eastern District of Virginia, stem from an EPA investigation into allegations IBM improperly obtained information about a contract it was bidding on from EPA employees, said Fred McNeese, an IBM spokesman.
Earlier in the day Federal Times learned the EPA indefinitely suspended IBM from doing business with federal agencies. The suspension was posted on March 27 on a GSA Web site that lists companies barred from receiving federal contracts…

IBM, based in Armonk, N.Y., did $1.4 billion in government sales last year. Its biggest customers were the Homeland Security Department, Army, Centers for Medicare and Medicaid Services, National Oceanic and Atmospheric Administration and Defense Information Systems Agency

RTFA: http://www.fec.gov/pages/brochures/fecfeca.shtml

Prohibited Contributions and Expenditures

The FECA places prohibitions on contributions and expenditures by certain individuals and organizations. The following are prohibited from making contributions or expenditures to influence federal elections:

Corporations;
Labor organizations;
Federal government contractors; and
Foreign nationals.

Furthermore, with respect to federal elections:

No one may make a contribution in another persons name.
No one may make a contribution in cash of more than 100.

In addition to the above prohibitions on contributions and expenditures in federal election campaigns, the FECA also prohibits foreign nationals, national banks and other federally chartered corporations from making contributions or expenditures in connection with state and local elections.

I stumbled across this page while doing some political research. The fact I was looking for is corporations are prohibited from donating money to presidential candidates.