This morning (May 28) the U.S. Dept. of Justice released a (fairly extraordinary) statement outlining the allegations. Fourteen individuals are accused of various offences in relation to "a 24-year scheme to enrich themselves through the corruption of international soccer." Four other individual defendants and two corporate defendants have pleaded guilty.

Specifically, the charges relate to the practices of CONCACAF -- the federation that oversees football in North and Central America -- and its dealings with a number of U.S. and South American sports marketing companies. Over $150 million in "bribes and kickbacks" is alleged to have been solicited and paid to secure media and marketing rights to international tournaments and fixtures, including World Cup qualifiers, the Copa America, the CONCACAF Gold Cup and Champions League, and the Copa Libertadores.

When the FIFA corruption scandal broke, it was centered on CONCACAF.

Quote is from the related link I added.