UNCLE SAM WANTS $6 MILLION FROM SUGE KNIGHT!

Remember when Suge Knight had money? The government sure does ... and they want over $6 mil from the former rap mogul.

According to court docs, a tax lien originally filed in 2003 -- against Suge's 1996 tax return -- was re-filed again in January to the tune of $6,578,696.31. 2Pac better put out a new album STAT!!!!

Suge's baby mama filed child support papers against Suge in January which revealed Suge's net income is only $1,207 a month.

So don't hold your breath, Uncle Sam.

Calls to Suge's people were not returned.