In terms of analysis of "class consciousness" (consciousness that wage workers, by virtue of being wage workers, have common interests antagonistic to capitalists in a capitalist economy), we ought to set police officers and prison guards apart from other public-sector workers, but in terms of an ability to get organized to assert their immediate interests against management on the basis of trade, workplace, and/or industry (which unions are mostly about), police officers and other union members don't seem to act in very different ways, except that the police have it easier than teachers, transit workers, etc. in the same public sector, because capitalists depend on the police -- first responders in defense of private property, so to speak -- more fundamentally than on any other group of workers.
I'm basically saying here (against the "Bitch | Lab" claim) that an antagonistic relation to "customers" (which in the case of the police are the public they "serve and protect") is hardly an obstacle to unionization. In fact, a union's ability to give workers the right and ability to fight against customer abuse and get compensated for it by management in the event of customer abuse is one of the selling points of unionization in any service work. Take the transit workers in New York City, and see what's in their new tentative agreement that they won by striking, e.g.:
<blockquote>ASSAULT PAY
All employees in the titles of Bus Operator, Train Operator and Conductor shall be entitled to assault pay (“run pay”) for up to two years for injuries incurred on duty as a result of physical assaults. The assault pay consist of a differential payment which shall be sufficient to comprise, together with any Workers’ Compensation payable to him/her under the provision of the Workers’ Compensation Law the amount, after taxes, equal to his/her after tax wages for his/her scheduled working time at the time of the accident.
<http://twulocal100.org/index.asp?Type=B_PR&SEC=%7B935B2C90-91BF-46F4- A7A0-26E576FF26B5%7D&DE=%7B69CC2208-796F-4CD2-98C4-F17C7739F90A%7D></ blockquote>
Yoshie Furuhashi <http://montages.blogspot.com> <http://monthlyreview.org> <http://mrzine.org>