You can see in footage captured by a fan in the stands ... one man invaded the outfield while carrying a big sign.
Quickly, however, he was tackled to the grass -- and then jumped on by 5 other guards.
Meanwhile, while they were trying to reel in the first protestor, a second one jumped onto the field as well. Immediately, though, that fan was dropped to the ground too by a security guard.
Eventually, all of the protestors were taken off the field without further incident.
The signs they were holding reportedly read Bishop, La Loma and Palo Verde ... and represented three low income neighborhoods of Chavez Ravine that were removed in the 1950s in order to build Dodger Stadium.