Not quirte, Axel. The concept of "terrorist" was already one that means different things to different people. To the Judeo-Christian mind, blowing up people in pizzarias, coffee shops and at falafal stands is terrorism, as well is flying planes into buildings, shooting wheelchair-bound sea-cruise goers and then throwing them and their wheelchairs into the sea, or even starting wars with neighbors where rockets are rained down onto civilian areas with no military value. In the minds of those who do such things, not allowing them to do so is totally unacceptable, to the point that it causes them great angst and, some might say, even feelings of terror. The U.S. Congress acts through legislation, in order to have the legal means to deal with terror-sponsoring organizations that are dealing with terror, themselves. The Iranian ruse of a "parliament" plays games. It is a non-issue, really; no different than kids putting on suits and trying to play like adults.
Death toll from Yemen rebel attack rises to 55 after 10 Saudi troops killed (AP)
from the article: Iran's parliament approves labeling CIA, U.S. Army terrorist groups