1)
What is the meaning of "Karvu Rodefei Zimah"?
1.
Rashi: It is the counsel of sinners.
2.
Radak: They are close to and cling to Zimah, and pursue it. Zimah is abomination and evil deed - "Ki Zimah Asu" (Hoshe'a 6:9), "Zimah Hi" (Vayikra 20:14).
2)
Why does it say "mi'Torasecha Rachaku"?
1.
Rashi: They distance from Your Torah to draw close to the counsel of their evil.
2.
Radak: It is the opposite of Zimah, which they approached.
3.
Malbim: There is nothing that unites sinners; they are separated in their lusts and deeds. Each chooses a different evil - "Nefesh Rasha Osah Ra Lo Yuchan b'Einav Re'ehu" (Mishlei 21:10). What unites them is that they distanced from Your Torah; they all deny it.