Students owing allegiance to PSU gheraoed private buses operating in the state, in which they claimed the Badal family had shares.
A clash took place between students and police when the PSU members smashed a private bus in Faridkot city.
Police arrested 14 students under various sections of the IPC and sent them to jail, officials said.
PSU president Karamjit Singh said that they had given a call to gherao all private buses operating in Punjab.
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Protests were held at Sangrur, Patiala and Jalandhar as well, Singh said, adding that the protesters gheraoed Orbit bus offices in Jalandhar, Sangrur and Patiala and blocked Bathinda-Sangrur road.
Meanwhile, Left parties, including CPI, CPI(M) and CPI(ML), also staged protest at different places in Moga district, including Kot Ish Khan town, Nathoke village, demanding filing of case against owners of Orbit Aviation and cancellation of its permit.
The protesters also burnt effigies of Sukhbir at different places in Punjab.
However, police said that the situation was under control though private bus services were disrupted at different places.
A woman and her teen aged daughter were allegedly molested and thrown off a running bus, belonging to the ruling Badal family in Punjab, leaving the girl dead and mother seriously wounded, near Gill village on Moga-Kotkapura road on April 30.