The Game -- Warns Cardinals Fans ... Careful Where You Wear RED in L.A.

Cardinals are red ...
Dodgers are blue ...
But be careful where you rock those colors ...
Or it could mean THE END of you.

At least, that's what The Game told us out in L.A. the other day -- when he warned Cardinals fans that sporting RED in certain parts of town could be bad for your health.

Game is clearly referring to the Bloods (red) vs. Crips (blue) rivalry ... telling us:

"It depends on where you out out here ... because the Cardinals are red ... you get caught slippin' in the wrong hood, it might not be about baseball. It might be about baseball bats."