The First Amendment is being put to the test at the Supreme Court today.
Justices are looking at how the free speech rights of abortion opponents stack up against the rights of women seeking safe access to clinics.
They're specifically examining a Massachusetts Law that creates buffer zones outside the clinics.
It's marked with a yellow line painted near the entrance of clinics.
Activists say the law violates their right to free speech.
"What the law does, it just says everybody stand back from the door way, to create that un-obstructed access, " said Marty Walz.
In 2000 the Supreme Court upheld a Colorado law creating a buffer zone around abortion clinics.