A couple of protestors didn't get too far with their signs when they ran onto the field during the Dodgers game Wednesday -- 'cause stadium security ragdolled both of them to the ground in seconds.

The wild scene all went down in L.A. -- when the Dodgers were playing the Diamondbacks at Dodger Stadium.

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.