The United States Justice Department is launching an investigation that targets some of the world’s top technology companies.

At issue for the Justice Department is whether or not the companies violated antitrust laws by agreeing not to target each other’s top talent, according to a Washington Post report. The Federal probe is determining whether or not that stifles competition and allows companies to maintain their market dominance.

Citing an anonymous source, The Post said the review is industry wide, but it is looking at Google, Yahoo, Apple and Genetech.

The probe is said to be in its preliminary stages.